How high are you tapping? Most likely you are using an 18v or larger drill.. and when it starts to work a little, it will "torque" twist on your hand, causing the whole drill to move and make the hole out of round. Stepping back to a 12v drill and it usually will stall out before twisting in your hand.
2008 4 buckets
~
2016 1300 vac tubing
18x24 sugar shack
2x6 Grimm Lightning w/preheater on natural gas
7" full bank press
CDL 600 RO
2000 Sonoma w/ 200gal tank
2003 Duramax w/ 500 gal tank
2 sap guzzling kids
very patient wife!
Same ol' addiction