i have used the old type & bought the new mack one & i am not having any luck.here are some pics. the old one is striped out & the new one doesn't compress the rings enough to get in the cyl. i had to use a rubber mallet & tap around the mack one to get it to settle in enough to maybey go in . major fight & i lost 2 second rings & 2 oil rings. 3 different pistons . i swear i'm not a tard. any tips or better tool info apriciated.