TR4 Window gasket - Help!

[cyf@bighorn.dr.lucent.com (Charles Y. Farwell)]

        So I know there must be a trick. I'm trying to replace the window
        gasket - the one that holds the bottom edge of the window in the
        channel of the crank assembly - on my Tr4. The new gasket is thick
        enough that no amount of downward pressure will press the
        window+gasket into the channel. I don't want to break the window
        trying!

        Has anyone been successful at this? Any hints appreciated!!

Thanks,
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Charlie Farwell             1962 TR4 #CT3852L
cfarwell@lucent.com