Something to share:
Ihad difficulty in getting reliable operation of the main LGunits that came with my plane
Ifinally had to disassemble them and do this:
1. Polish the main shaft that supports the trunnion as it was very tight (held in by 2, 4 mm screws)
2. Disassemble the air cylinders and polish the shaft as it was quite sticky
where it protrudes through the oring embedded in the cylinder end
3. Put BVMair cyl lube in the cylinders
4. What made the biggest difference however is that Ihad to remove some metal
on both sides of the sideplates that enabled the mecanism to freely operate in the "extend"position (gear down)
otherwise the gear(s)would not go down reliably except under high pressure.

After all of the above mods, they now operate down to 30 or so PSI!
See pics.. lookfor the small arrow... Ifiled here...