Ideas for a double acting ram

I'm going to try and use the pneumatic system I have spare and I have nearly all the parts to make a bot so I'm thinking what the hell but I'm trying to think of ideas for a double acting ram

So far I can think of a axe, front hinged flipper or a 4-bar flipper

Any other ideas for one?

Grabber/lifter?

TAN style?

Difficult to do in 13.6kg

Any others, I don't really want to go for another flipper, something a bit different would be good

AXE :proud:

I might do it battle axe style coz I got Wana fart about with rack and pinion stuff

what!? :|

Battle axe uses chains and sprockets etc which I would probably do :)

I'd love to see a 4-bar lifter. Don't see them around much anymore. When done well they're better than rear-hinged flippers for launching, it would seem. :)