because I used Tpm2 since 20 years ago, then I used tpm3, and 5. Other than tpm2, they are not damaged easily: I used trinity 52000 rpm motor. I support this hk products just because it is not bad. Why we have to buy substantially more expensive but slightly (maybe) better foreign products?
during that era........Reedy modified (hand-winded 14T) usually had ~ 28000 to 32000rpm at 7.2V (as quoted by the factory).......
while Trinity started to release some sort of hand-winded 11T, 12T motors...... plus 12V as the testing voltage.....which pushed them up to 52000rpm.......of course if they were all using 7.2V...... 12T Trinity should still be faster than 14T Reedy.......