Jim, I'm glad the cabinet is going to help (not financially but hey!).
I had a minor screw-up in my Musical Ice Box project. It's all 23/32" plywood and I bought a 23/32 router bit to cut a dado for a shelf. Used my Bora guide and everything looked perfect. On closer examination, the dado is deeper at one end, almost 1/8" deeper. You can see the change in plies on the right side.
I decided to quit rather than continue (and make matters worse). My first thought was to set the router depth the 1/8" deeper and do the whole dado over again. That was yesterday.
Today I realized I had a zero chance of re-routing the dado by machine without making it wider. I checked my hand plane collection (2) and nope, I don't have a dado or router plane. After deciding not to bid on the already too expensive eBay planes and not order the $159 router plane set, I tried the minimal cost approach.
Clamped a 22-inch length of 120-grit PSA paper between a 23/32" plywood off-cut and a 3/4" scrap of one-by-four. The two-inch section of bare plywood ensures I can get the piece started in the dado without the sandpaper scraping the sides. Cut the paper with a rolling cutter blade and stuck the sandpaper to the edge of the plywood.
Because one end was already deeper, I scored the ply at the bottom of the dado and chiseled the layer of ply at the bottom to match the deep end. Now it's just sand and chisel until the whole slot is even.