Inquiry (采购产品): engine hoist hydraulic pump kit hello. i have 2 nominal hydraulic pumps each roughly 2 feet long with a 4 inch diameter. they're used in an engine hoist to pull & set automobile/ boat/aircraft engines. they have 3 such pumps here. one is new. the 2 others need to be rebuilt. can i use ordinary O-rings top to bottom to fix these 2 bad units or do i need leather in a place or two? please get back w/ me asap. thanks, Peter of BofA Int. // **** Hidden Message ***** peter giannini 92345 Company: Bankamerica Int E-mail: brothelarium@aol.com **** Hidden Message ***** brothelarium@aol.com