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Pickingpaul
possible on both accounts.Funny you ask on the 10" it worked fine but on the 14" I had to put a slight angle as to make it go into the corners but not quite as acute as yours in all honesty don't think having a more or less angle really matters any much difference just make sure the top of the bar is slightly longer than the bottom if that makes sense I think the main thing is not cutting sleeve after cutting the bar.1st reason I thought maybe the cut t bar could scratch painted frames.
2nd thought the sleeve would fray and shelf life reduced.
i would agree and say to leave the sleeve now, after getting new ones and trying it, it works fine with just the t bar can down.
i havnt scratched anything with the t bar as the sleeve is still longer slightly and the squeegee channel itself stops the t bar getting to the edge