is there a trick to fitting a british 1907 bayonet into a pattern 37 frog?

i have managed to slide it up to just below the scabbard button but it is very very tight and i'm worried i might damage the scabbard trying to lever the top loop out to go over the button.

would soaking the frog loosen it enough to make it a little easier?
do i need to pre-stretch the frog?

thanks
henry.
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