Some time back, I fitted a wooden ball to a hand reamer/trimmer for
trimming shell casings. Same problem but on a smaller scale. Got a
wood ball that already had a dowel hole. Reamed hole out a tad to the
right size. Dab of quick set epoxy, and some spray paint, and it works
fine. Make the hold just deep enough to secure the pipe -- maybe 3-4
pipe diameters, at most. The epoxy will keep it secure. Try for a
pretty snug fit.