[b0w_bender]

OK check this out, I made my own air piston so I could practice my finger release. On the genesis bow I used an old arrow as the piston shaft on the big boy bow I used a .25 aluminum rod. the piston is just a piece of wooden dowel that fits rather loosely in the tube. I thought I had done a full thread on it but I can't find it.

 

[b0w_bender]

Can you adjust the pressure?

If you want less pressure you could drill a hole in the end of the tube. My first attempt had pretty tight clearance on the piston so I had to drill a small hole in the end to get it work correctly. The first time I released it the air pressure was to great it took 2 or 3 seconds to get back the the normal brace height.

 

[b0w_bender]

Here is a cross section of the unit I made. It's real simple it's just a tube with a piston. The tube can be anything PVC pipe Aluminum thin walled tube what ever not really all that critical. Then place a piston\plunger on the inside, I used wood dowel but again any round stock will do as long as it fits within I would say a 1/32 from each side, To tight and it becomes to hard to draw and slows the piston too much during the shot. Lastly you need to attach some sort of mounting bracket to the side. If you use PVC pipe you can easily glue a piece of PVC plastic to the side of it and screw on a bracket to that. I use the plunger hole to secure it to the bow. If you could scheme up a quick disconnect that would be even better.