I do not know why they close questions.I know what you are talking about, here's what to do.. If the kit has a drill bit sticking out the end of the hole saw, ( Most kits are junk) so you may be better buying a new hole saw with a replacement type drill bit. Take the bit out of the saw and replace it with a longer (same diameter) bit. Take a piece of wood and clamp it to the other side of the door. drill a hole (same size as the longer bit ) into and thru the wood piece in the exact center.. Now you have a guide for using the larger hole saw to cut the hole larger. It works.. My 2 cents. – d.george yesterday

If the kit has a drill bit sticking out the end of the hole saw, ( Most kits are junk) so you may be better buying a new hole saw with a replacement type drill bit. Take the bit out of the saw and replace it with a longer (same diameter) bit. Take a piece of wood and clamp it to the other side of the door. drill a hole (same size as the longer bit ) into and thru the wood piece in the exact center.. Now you have a guide for using the larger hole saw to cut the hole larger.