My stones are solid.
I use a 7/8" boring bit with extension on it for depth. I ground a little off each side to make the hole just under the 7/8". Then I tap the top part using a piece of pipe with 7/8" OD thread, I think it's 3/4" pipe where I cut long narrow "v" groves along the length of the threading and then squeezed the ends together so now the threads have a slight taper but still have a gap.
I screwed the other end of the pipe into a "t" for the same dia. pipe and shove a large screwdriver through the "t" when using it as a tap for the hole in the basswood.
I use 3/8" nylon firm tubing inside the skimmer, fastened to the stone with 3/8" vinyl type air line, and the same vinyl air line from the top end of the skimmer to the linear compressor.
I tried to get mileage out of trimmings left over after making a batch of stones, gluing together like yours appears to be, but it came apart in only a few days. I guess I didn't use the right glue.
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