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andyathome
10-29-2015, 03:44 PM
found this on youtube this morning.
very simple and no need for an extra cylinder.
Make it with a pin that can be removed so that thumb can be stored in the up position , and you have operating thumb when you need it.

https://youtu.be/7NpREiGCLOk

cheers andy

SmallHaul
10-29-2015, 09:23 PM
Clever design, good find.

bigford
10-29-2015, 10:29 PM
there is a 1:1 version kinda like that