It's my understanding that you should be careful what you use for lubricating your parts. On the Groco there is a rubber bushing used. It is apparently not good to use a petroleum based (solvent?) grease on this rubber. You should use a silicone based grease, also known as plumbers grease? That's my story and I'll try to stick to it! Jim TWINS ...................................... Enjoy Every Sandwich ! ......................................