Was on Stuka Stunt centuries ago , re ' Big Art ' OS 35 S . Said I believe , to stop ROD walking aft .
Thus the Dia. of the top of the nylon ' T ' is something like the Big End O.D. , & thickness almost same as dist. crank pin to backplate .
Handy to drop in Any OS 35 S Id imagine .
Threw a rod once , big end threw out between oil holes . Engine used from new in aerobatic things , probly lugging it a bit . Mayve been on 11 X 6