The screw hole is quite loose so the entire tool can easily get out of position when installing the seal. Works well as long as you keep an eye on it, pre-lube the seal, start as close to the center as possible and work your way up slowly. So far there are no leaks from the new gasket, unlike the one I supplied with a bit of home-made woodwork. Most of them are actually from the same factory as far as I can tell so should be a reasonable buy for the price. I didn't use seal remover as I already have one with a metal barrel and hook painted black. end that works great.