To compress the lip seal I use zipties and then use freez spray to cool it, works great.
Or you could zip tie it and put it in the freezer.

Just my


1970 Super Stock Challenger ex. Paul Rossi
1968 Dodge Dart GT 340
1968 Dodge Charger /6 3 speed manual
1966 Chrysler 300 Loaded
1968 Dodge Charger R/T 440

1968 Mini Cooper