Did you try another seal? And then install it cold without having the slider present on the crank?
I have never done it like you have tried, I have always split the cases to install new seals (and bearings) so I cannot comment on best practice. But applying heat isn't a method I would use for seals. They should normally go in without applying too much force.
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Anders
"So you know, that you're over the hill when your mind makes a promise that your body can't fill" (Little Feat: Old Folks Boogie)
2015 EC200 Racing: TE bars, Rekluse Core Exp 3.0, 38mm Lectron & Ohlins S3 steering damper
2006 EC200: 2011 plastics, Rekluse Z-Start, revalved KYB forks & Scotts steering damper
1998 Bimota Supermono
1986 Duc Mille S2
1975 Guzzi sidecar hack
1961 Morini Corsaro 125
etc
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