[tubman]

I once had a problem with the glass bowl type pump where there was a slight leak around the glass bowl. It was very difficult to find, but when I did, I solved it by lapping the mating surface of the glass bowl using wet-r-dry paper on my surface plate and re-installing it using a new CORK gasket. It seems counter-intuitive, but the cork gaskets seem to seal better than the neoprene gaskets usually supplied with the kits.