I know he did tap/thread the acrylic. I believe he said it wasn’t hard but for all the holes he did it was tedious and time-consuming. When I made my skimmer neck cleaner I sandwiched the rubber squeegee between 2 pieces of black acrylic and tap/threaded 3 holes for that and it was time consuming for those 3 holes. I can’t even imagine how long it took Goober to do like 40 holes.
On this pic you can see the 3 plastic thumb bolts I used on my neck cleaner