- Joined
- May 14, 2008
- Messages
- 323
- Reaction score
- 426
My acrylic sump has a hole drilled for a 1" bulkhead but I need to enlarge the hole to fit a 1.5" bulkhead. Obviously if I use a hole saw with a centering bit there is already a hole so nothing for the bit to drill into. The hole saw will jump around and create a mess. Is there a secret method for this situation? I was thinking maybe make a template out of wood with the larger hole in it and clamp it to the top of the sump then drill the sump through the wood template to stop the hole saw from moving.