So I ordered a nice little compass off eBay the other day... then my impatience kicked in and I busted out the power tools. I found it's quite difficult to draw a perfect circle when you can't find anything in the house that is the right size. But lo and behold, I did a fairly decent job on my first set of spacers. These are 3/4" MDF rings for my old skool Kicker SS drivers.
What tips or techniques do you have to make a good speaker spacer when you don't have a router available?