While I was working out the details for how to mount the casters, I spent some time finishing up the rotating platform. I made the fixed and sliding stops out of more of the salvaged ash already incorporated into the top.
After milling some pieces to match the thickness of the platform, I selected one for the sliding stop and routed a dado to accept an ash runner.
Because there's a specific side for each tool and a particular way I need the tools to rotate in/out of the cart, the runner needed to be attached to a specific edge of the platform. I'm just screws to attach the stops - I want to be able to remove them if necessary to shave the platform's radial edges if the fit is too tight. Trimming the overhang.
I cut a set of the sliding stops to length - not quite half the width of the platform.
I got a box of these bicycle quick-release cam clamps on Amazon. They don't seem too robust, but they should work for holding the sliding stops in place. I removed the included threaded knob and substituted a dowel nut.
Holes for the dowel nut and the clamp shaft:
A slot in each of the sliding stops limits their travel. Fully retracted, they'll be 1/16" in from the edge. Fully extended, they'll stick out 1-1/2" inches. (I added the extra extension just in case I decide to widen the seat where they'll rest.)
With the sliding stops mostly complete (I still want to glue on some kind of knob to make them easier to slide), I attached the fixed stop on the opposite edge and the platform was ready for action.
Thanks, guys. Yeah, it's coming along. I had a productive weekend and the cart is almost complete. I've got another batch of photos to share in the next post.