My trans is losing oil and my crankcase is gaining oil, so I ordered a seal for the hydraulic pump and a couple of gaskets that came in on Wednesday. I've always pulled seals with screwdrivers and foul language, but looking on YouTube, it looks like a lot of folks are drilling a hole in the seal then threading a sheet metal screw into it and either prying on it, or pulling it with a slide hammer. What's your favorite method?