It's time to replace our leaky kitchen mixer. I purchased a decent flexible head mixer from Bunnings requested by the boss. However the original sink hole is approx 34mm and the new fitting requires a hole of around 38mm.
Conical drills or step drills are the tools to do the job, but they are quite expensive for the size I want.
Does anyone have one lying around I could borrow or alternatively an ideas on how to accomplish this task without said tool?
I'm probably going to end up do this by hand with a semi circular file. I have a Dremel clone but the dremel bits I have are too soft for stainless steel.