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If you don't use a properly fitted drift, youll ruin the seals before you damage the cups. Remember, the seal goes in from the BOTTOM of the cup, and is held in as a sandwich between the top of the fork leg and the shoulder inside the cup.
Take a wire wheel and thoroughly clean out the inside of the seal cup before attempting the install. Squirt with WD40.
A large wooden dowel with a giant flat washer up against the seal makes the best drift. Set the seal cup SQUARELY between the dowel and a flat piece of lumber such as 1x4, press them together with your vice. Eyeball the assembly every 1/8 turn of the vice arm, and make sure it is seating properly.
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