Hi, I'm Nancy. I'm brand new to woodworking and this forum. I have a Craftsman Plunger Router Model 320.27669 12amp, 2HP with 1/2" collets and 1/4" collets. The router is brand new with the 1/2" collet already installed. I purchased a Leigh FMT Super Jig to make Mortises and Tenons for several wine racks I'm making. The bit included with the Jig is 1/2" diameter. The bit does not fit in the 1/2" collet. Collet is measuring a diameter of just less than 1/2". I cannot remove the collet, it is frozen in the shaft. Any suggestions other than get a new router. I measured the bit and it is 1/2". I may be new, but I assume a collet listed as 1/2" should support a 1/2" bit?? Thanks.