Can anyone tell me the overall length of a cricket MK1 reg for 120/125 bar setting. I'm thinking 54.4 mm but probably wrong. I remember seeing a video somewhere but can't seem to find it. Any help appreciated 

I've done 4 at the same measurement and all been around the 120/125 bar mark When falling off the reg on chronoJust my thoughts here but I believe going on measurement for a reg setting is not a good practice. It's one thing to take a measurement for the reg in your hand, rebuild it and put IT to the same measurements. It's a whole different animal to expect those same measurement will accurately apply to a different reg.
It might of been one of Ernest's I saw but can't seem to see it nowMaybe this could help :. There are some others video from Ernest Rowe abour Kalibrgun regs.