What is the best tool to use to install new pinion seal in 8.75 (741 case)? I removed the old seal and had the correct new seal in hand. Tried using a block of wood to persuade it to go in. Took my time and was moving the block of wood around the outside but the fit was very tight. I managed to get it seated but the outer lip was obviously damaged. I believe I actually managed to make the leak worse. Have new seal on order but I'm convinced there is a better tool to use for install. I just need help in identifying that tool. Thanks.