Need ideas

[njmr2fan]

So I have this hole in my dash from an old Faria depth gauge, and I have this sweet compass I got from a friend. Compass is about 2 5/8" and hole is 2 1/4". What's my least destructive way of enlarging this hole evenly?

 

[Ilmmct]

Can you remount the old compass after removing the glass? Then buy a 2 5/8" hole saw bit and drill the starter hole through the center of the old compass? Tape the heck out of your surrounding helm to protect against slippage.

 

[Scott E]

some hole saw kits have enough threads you could get the 2 1/4 inside the 2 5/8 to use as the pilot bit. Another way I've done it would be to cut the 2 5/8 hole is scrap plywood, then use it as your guide. Have to go slow and tape / hold on the board really good.