Thats interesting how your Tri Gear Mechanical Retracts set up functions it reminds me of a friend ages ago that was studing Aeronautical Engineering and was more "challanged to "set his C/G mechanical retracts ,"than his majors-- I think he was using a Carl Goldberg products mechanicals retracts and a 'special,'servo that was about the best choice for a mechanical retract servo/actuator of the period late 1960's [8D] in those earlier years of Digital Radio Control development,which had yeet to incorporate (end point adjustment[:-]
I went with Rhom Air from the start as opposed yo mechanicals and had lots of issues with air leakage;so when I tried a set of Spring Airs and they are reliable,tiough and well engineered retracts
I just got a new set of Spring Air 85 degree 3/13 mains and now they have adjustable axels for either strut diameter including 5/16 and another thing new to me was the air control/filler valve thats way cool.