From: To: Subject: Re: UL: compass Date: Tuesday, April 04, 2000 7:52 PM you would use a light grade of mineral oil and put the oil and the compass in the deep freeze before you fill it so the oil in the compass and the added oil will shrink completely. Then fill and seal uo.. Good Luck and I recommend new seals as they are cheap. Maybe a dollar and lkess leaks. Bill Cartwright