I bought the machine from MicroCenter yesterday. I know that the machine comes in assembled or kit version and I was surprised to find out that I got the assembled version. It uses engraving bits with 1/8" shank about 1-1/4" long. I think that router bits may be too long. When the engraving bit is installed in the machine, I have about 1-1/4" clearance between tip of bit and table. Any suggestions about router bits? The working area is about 6" and 4".