We currently have a VERY janky ratchet and would love some input of how to make it better. The ratchet is engaged to keep our lift up after hanging. The pink string in the image is tensioned by a 5.5W motor across the robot. We just ordered some of the V5 pneumatics kits, so I’d love to incorporate those into the design.
a couple things, I would switch the string to a rubber band, then use the pneumatics like is done by 6277C
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that ratchet needs to be banded down for more pressure, since it can slip. use washers if you can (metal) since aluminum single hole can spin and bend, and even snap.
That pink string sure looks familiar… if you’re looking for a ratchet that can disengage and reengage, you could have an elastic pulling the bar towards a gear, and the piston pushing it out so that it doesn’t contact.
From all of the ratchets I’ve built, the ones I trust the most use either a metal gear or a sprocket. They can work fine with plastic spur, but under a heavy load typically one of these are better, if you have space to bolt it to the gear that you want to ratchet. Good luck 
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