One correction Rom's (also Rhom) used no locks and pressure only in the "up" position.
If you lost pressure (I used them for more years than I can count and NEVER had that happen) then the gear sagged to wherever gravity took it.

I frankly prefer the 'no lock in up' feature as you simply stall them into foam and eliminate virtually all of the vibration wear.
I still have two sets of Rhom's with lots of spare parts. I bought them (parts and second set) when they were new as I expected to need it.

Didn't happen.

Never used the parts and the second set had all of two flights on a back-up plane.
As implicated earlier I flew the Rhoms for many hundreds of flights over a number of years (Pattern) and with the exception of two metal links on each main (I have the parts) there is no perceptible wear.