Compact Bulldog Bone

Bow Down Worthy GIF - Bow Down Worthy Praise GIFs
 
The logs are all southern yellow pine, with cedar on the interior gable end, and shiplapped pine that we milled on the cathedral style ceiling. the full basement uses oak beams that we rough sawn (at a local mill) down the center to support the floor stringers. The foundation walls are stone veneered as is the chimney with stone we salvaged off a road construction project. There is 2 inches of styrofoam insulation on the roof and 1 inch in all the chink joints. The concrete/masonry chinks are held in place by expend metal lathe (inside and out). The ash tree which Caleb removed for us (it was leaning more and more over the house) was born about the same time I was. You can see the stump in the picture.
 
Brian, a long time user of the Bulldog bone, has urged me to try to make the Bone work on 9mm line and I believe I have a working prototype. It uses an elongated bollard added to the outboard end of the top friction link, and a round bollard on the outboard end of the bottom link. Pull testing has yielded good results and it tends and releases well also.
I have ordered the special order top bollard. The nice thing is, with the addition of the 2 outboard bollards, It is entirely convertible from a stock Bone to the 9mm compatible, and back to the regular Bone, and also midline attachable. Once I have the special order bollard in hand, I will post up pictures and further testing results.
 
I've had a few occurrences where a dead twig had lodged itself behind the elongated bollard. I noticed it quickly both times but have been wondering since, how that might effect the function of the device. Has anyone else had this happen?
 
surveyor said:
Brian, a long time user of the Bulldog bone, has urged me to try to make the Bone work on 9mm line and I believe I have a working prototype. It uses an elongated bollard added to the outboard end of the top friction link, and a round bollard on the outboard end of the bottom link. Pull testing has yielded good results and it tends and releases well also.
I have ordered the special order top bollard. The nice thing is, with the addition of the 2 outboard bollards, It is entirely convertible from a stock Bone to the 9mm compatible, and back to the regular Bone, and also midline attachable. Once I have the special order bollard in hand, I will post up pictures and further testing results.
Click to expand...
Would this allow two 9mm or potentially two 8mm lines to run through the device?????????????!!!!!!!!!!!!!!!!!!!
 
Two 8mm lines is too wide of a rope path for the Bone. If a special order wider link and spine was used, I see no reason why it would not work.
 
Results with the pull test indicate that the Bone will hold 550+ lbs SRT with the 9mm conversion bollards. This is using the stock elongated bollard, in conjunction with the conversion bollards on the outboard ends of the friction links. It holds 450 lbs with the stock adjustable brass bollard in conjunction with the conversion bollards. This is with new spine and new bollards all around. This is also using the stock spine and lower arms with the grooves. It tends and releases very much like the stock Bone, and works DRT just like the Bone. The outboard 9mm bollards are captured by the taper pins on the ends of the friction links.
 
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