The router rides this jig much like a train rides a pair of tracks down a hill. The router (the train) rides on two tapered runners (the rails). The runners are supported by a base (the track bed). And two guide blocks keep the router running straight. (I cut these parts from 3V'-thick pine.)
Since I wanted a Vfc" taper along the length of each spindle, the router has to go "downhill" along the length of the jig. To do this, cut a Vfe" taper on the runners (A), see Fig. 1. Then the guide blocks (B) are screwed to the runners.
Now the runner and guide block assemblies are ready to be screwed to the base (C), see Fig. 1. The trick is to screw the assemblies down so the base of the router just fits between the guide blocks.
Note: To determine how far apart the guide blocks should be from each other, measure the diameter of the base plate on your router and add Vi6". Also, when screwing the assemblies down, leave an overhanging lip at the front of the base. This lip is used to clamp the jig to the workbench.
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