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Air actuators was one of the things I tried before posting. I was mostly getting ones that were configured to actuate valves.

Ok, the link works on my laptop. That particular cylinder is too small, but just knowing that Bimba also makes them with spring-extend and air-retract is helpful. Thanks!

I have been I unpinning at the bottom so they stow out of the way on the boom When I reattach them, I find it easier to pull the T pins to let them telescope, pin the bottoms, then adjust the boom until the T pin holes line up. Working by myself, it is easier to line up the T pin holes than the...

The link didn't work on my phone. I'll try it on my laptop after lunch. Which way does the spring go? The Bimba cylinders that McMaster carries all have the springs going the wrong way.

Bungee cords might help. Thanks for the suggestion.

I'm brainstorming a possible truck modification in which it'd be handy to have a pneumatic actuator that works just like an air brake spring canister, but is smaller and has lower actuation forces. The actuator would need around 1"-2" of travel, push out the actuation rod under spring pressure...