I made a quick jig to run flutes along some cool little muddlers I had turned.
Step 1: Build the sliding base
One piece of wood, cut exactly the width of the gap (2.5") and 6 inches wide forms the guide. Another piece, slightly larger (3"), goes underneath the bed and keeps the jig from tipping over or sliding out.
The gap was 1.5" deep, so I made another piece 2.5" wide, and slid it in between the two. However, it needed some sanding down to keep the slide flush with the top of the lathe bed.
Two pieces of threaded rod slid through all three pieces are for tightening your jig down. (with a nut on the backside or glued to the 3 pieces)
This whole slab slides up underneath the lathe bed and fastens to your jig