Over the years, I’ve seen many plans for homemade jigs that utilize a hardwood runner that fits in the miter-gauge slot. But, because wood shrinks and expands depending on the humidity, the runner’s fit and, hence, the jig’s accuracy will vary. To correct the problem, cut the runner a bit undersize so that it is loose in the slot. Then install four 1/2-in-long brass screws in countersunk holes along one edge of the runner. You can adjust the screws to get a perfect fit, regardless of the humidity. The brass screws won’t wear the sides of the slot and are easily replaced if they wear out.

Larry Loo, M.D., Clovis, Calif.

Fine Woodworking Magazine, June 1992 No. 94

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