What size cord are you using to pull the seal in? I have found that a too thin cord will cut the gasket. Something more clothes line size seems to work well for me.
I hope it goes well. 
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Dave O'Bryan
1977 911 Carrera 3.0 Targa
1987 VW Westfalia w/ 2002 Subaru 2.5 engine at home , 1991 VW Vanagon Hightop camper in Europe, 1987 VW Vanagon Hightop Syncro camper out West, 2014 VW Jetta TDI Sportwagen
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