thanks for the tip,i did try a flex shaft on my 3/8 drill when i first started the rims.i had no luck,i don't know if it was poor technique or poor product
but all the flex shaft did was kink and break at the end you install into the drill chuck.that was at 1500 rpm,i don't know if i'm brave enough to try that at 3000 rpm. maybe someone has more insight
thanks marsfroggie.