The only technique I know of is to make sure there aren't any dings on the edge of the bore from a piston bouncing off the other side from too much air pressure, then be sure to use silicone grease such as Dow Corning 4, 111, or 112 on the bore and seal before trying to install it. Never had a problem!
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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