Compact Bulldog Bone

The first generation Bones definately had problems interacting with Yale 11.7 lines. The new adjustable Bone has allowed me to dial in my Arrowfrog 11.7 perfectly. Just keep a small screwdriver in your pocket when you are climbing. So easy to adjust in/out and even while you are working the tree.

Or, if your line is brand new and you need a little extra bite to begin with, no big deal. Fine product Gordon!
 
Wow I've been MIA on this forum for a while, and when I return the BDB has an adjustable bollard? I just bought this thing a few months ago! Hahaha
This is a super cool integration @surveyor
I don't have the steadiest hands or the patience for tinkering with small parts, so changing the bollard for a different rope size and fiddling with the cotter pins was a chore. This addition will make the whole bollard/rope adjustment process easier and probably faster.

Are these parts available for order? And (just to double check) they can be fitted onto the newest version of the BDB, correct?


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The adjustable Bone is a well refined piece, especially when compared to a "page 1 Bone". The machining is gorgeous, and the effect is just what it needed. No more fiddling with cotter pins.

I've got it to work smoothly on 7/16" KMIII Max, which was really a surprise. I figured if it would work on that, it would work on just about any other climbing line.

Very nice work with the latest run, Gordon!
 
surveyor said:
Adjustable Bulldog Bone. This is the top arm which now has a baffle connecting the two top arms, and a captive 10-32 SS adjustment screw, tapped into a slotted bollard.
By turning the machine screw "in" it opens the gap between the bollard and the friction pin, by turning the screw "out" it decreases the gap and increase the pivot length incrementally, and since the screw is angled to miss the pivot pin, it also increases the "S" path that the rope makes through the top arm when weighted.

IMG_1881_zpszynitoes.jpg
Click to expand...

So impressed that you keep coming up with improvements for this device. I know I approached it with scepticism and naivety; that said my Bone - after bedding in with rope (and subtlety of operation) has been faultless since. Right now I have no need for the new upper arm (though very interested for future) - I'm yet to even get to the stage of considering flipping the spine.

Still to see the new arm design (other than photo) - random other possible design tweak popped into my head - feel free to dismiss/run with (pic below)...

20160606_180743.webp

The idea is to have the 'Rollers' allow the bollard to rotate - I'm no machinist though... What would anyone think?
 
surveyor said:
since the screw is angled to miss the pivot pin, it also increases the "S" path that the rope makes through the top arm when weighted.
Click to expand...

Ah - I just realised part of the design of the new arm was like this - maybe my idea might not be so useful...
 
Any video to show all the changes that had occurred since the design built before the introduction of the rubber ends of the upper arms of the BDB? That is the one I have, up to nowadays? What would it be to have an upgraded device with just the substitution of the new upper part and leaving the rest as it is? Thank you!
 
Tico said:
Any video to show all the changes that had occurred since the design built before the introduction of the rubber ends of the upper arms of the BDB? That is the one I have, up to nowadays? What would it be to have an upgraded device with just the substitution of the new upper part and leaving the rest as it is? Thank you!
Click to expand...

Surveyor should chime in, but until he does, I would say the new upper arms adds almost all the latest parts to the whole device. The only thing that is missing is the lower arm pin (which isn't that big of deal on the lower arm I am thinking) OR, and I know I should not say this but I will...Buy a new upper arm and ask surveyor for one more pin :-)

All and all I like the new arm BTW, though sadly they worked perfect for my cougar so no adjustment was necessary. Of course that is good but I had no reason to mess it up now.
 
I do have about a dozen top arm assemblies with adjustable bollard in hand. The rubber nubs did replace the aluminum nubs, and there are now taper pins at the end of each friction pin, and of course now the adjustable bollard, which all come with the top arm assembly.
I am currently out of spine parts, but have more on order, so hope to have those in hand soon.
David I will send you the extra taper pins for the lower arms.
 
Thank you for your replies D x D and surveyor. The point is that I don't understand yet what were the changes in detail and if it is really convenient to make any changes to the one I already have. Even the pins are not clear to me what are there for. Safety maybe? Can all this be explained or shown even in a video for me?
 
The adjustable top arm is interchangeable with the standard top arm, by removing the top SS link that connects the top arm to the spine, removing the standard top arm, and installing the adjustable arm. This allows you to change the gap between the bollard and the friction pin, without removing the cotter to change bollard sizes.

The taper pins provide additional support to the side swivel snap link, in the closed position, for a severe side load. There have been no issues with the snap swivel links even without the taper pins.

The rubber nubs serve the same purpose as the aluminum nubs, just different material.

hope this helps. Gordon
 
surveyor said:
The adjustable top arm is interchangeable with the standard top arm, by removing the top SS link that connects the top arm to the spine, removing the standard top arm, and installing the adjustable arm. This allows you to change the gap between the bollard and the friction pin, without removing the cotter to change bollard sizes.

The taper pins provide additional support to the side swivel snap link, in the closed position, for a severe side load. There have been no issues with the snap swivel links even without the taper pins.

The rubber nubs serve the same purpose as the aluminum nubs, just different material.

hope this helps. Gordon
Click to expand...
Pretty clear...Thanks Gordon! Could I also receive the price of it? In private as well?
 
Time to bite the bullet and purchase a new climb line. Was wondering what people were pairing with the bone. The front runner right now seems to be 200' of safari. Also have my eye on that kmiii.

Looking for opinions
 
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