I Have a stripped out transmission drain plug was wondering a couple things the thread is 1/2 - 20 should I use a tap and redo the threads to see if that works (use a new stock drain plug left hand side 1/2 inch long)? or should I use a self-tapping drain plug (right hand side 1-inch long ) and go that route? Also, wondering if I go the self-tapping route will I have issues with the length? Any help would be much appreciated. Thank you.