Hey everyone, I've been lurking on this forum for some time now, but I've reached somewhat of a problem. I've purchased my MDF, drivers, and sonotube, but for the life of me I can't cut my end caps. I attempted using a Craftsman router with a Bosch bit. The problem is I got about 1/4 of the way around my 20" diameter cap and the bit was dull and would no longer cut. I know the answer is probably simple, but I must be missing it and only have a limited time to complete this before going back to college. How did you guys cut your caps? Thanks.