Suddenly SRT basal anchors EVERYWHERE!!!!!!!!!!!

[Brocky]

A possible problem would be if something snagged your climb line and pulled it to the left. Having the top Blake's move in that direction could cause the bottom one to loosen up. This type of set up is used in DdRT to self advance your climbing hitch.

 

[diogenes]

A possible problem would be if something snagged your climb line and pulled it to the left. Having the top Blake's move in that direction could cause the bottom one to loosen up. This type of set up is used in DdRT to self advance your climbing hitch.

Yes you're right, for the photo I forgot to put a stopper behind the basal Blake's hitch to prevent such accidental movement. I've updated the photo to include a stopper. The similar ddrt setup is what gave me the idea to do this.

 

[Treetopflyer]

One way is take the end of mainline(climbline) form an alpine b fly or circus bowline , choke spar with enough tail to form Blake's with stopper knot on that end. Saves the need for other piece of cordage and Maybe safer with less hitches?.. I don't like the smaller diameter prusik cord as I feel it would grab too hard to lower if you really had to.. the same diameter cordage may be easier to work the Blake's. It worked well when we lowered in practice a few feet on vortex awhile back. Like whenever vortex came out we tried it I think.

 

[SomethingWitty]

Has this been mentioned before? Lowerable double Blake's hitch with separate cordage. The first one cinches the stem so there is no creep when slack is introduced, using the tail to tie a second so rescue is possible. No hardware required. Anything unsafe?
View attachment 48532

Even with the stopper, it doesn't cinch the trunk. You don't want it to be able to wiggle through a work day and find the slack to hop up the trunk, causing you to have some unexpected drop.
A bowline on a bight or figure of 8 loop would serve you much better in place of the lower hitch, wouldn't require a stopper, and you could easily incorporate a wrap before running through the knot to tie your blake's, virtually eliminating play in your cinch height.

Edit: An alpine butterfly also works there.