I have just bought a dovetail jig,lumberjack dtj300 and i need a 1/2" bit/1/4"shank with a bearing so it dosen't foul the fingers. I have an erbauer 1/2" router with a 30mm ID /83MM OD.guide bush I have a 1/2" doveatail bit which has a 1/4"shank but no bearing,so no good,is it possible to buy a cutter and remove the bearing,as toolstation have got bits with bearings from as little as £3.24. If its not possible i will have to buy one which will cost £12.20. Or can you recommend anywhere that sells a guide bush that is 12.7mm ID/83mm OD. Ive attached an image of my base.