Hi Extra

I've got the same problem with the door hinges...
You don't have to tighten the screws so strong.
And the best way to avoid this problem is to put a drop of epoxy glue between the hinge and the door to increase the contact surface ( the door is concave) and tighten the screw normally.
I also had to reinforce the harm hinge with a piece of hard wood for safety reason.

Same problem with the gear cylinder... I had to replace the O ring and put some ceramic grease on the cylinder piston shaft (it's in fact a lubrication problem).
Drop also some grease on the axis of the mecanic to avoid mecanical blocking.