Bought a house w/ about 20 windows installed by MY WAY in Wappingers Falls in 2016. Many of the operator cranks are broken. Failure point in all is the cast aluminum sleeve w/ small set screw, held in place by a drive pin. I need to replace 5 defective cranks, but would also love to have some of those smaller parts as replacement spares if they're available. Is there an updated version of more robust design?
Identifying marks: US PAT 361490, more numbers below difficult to discern.