ותקע כף ירך יעקב says the Shlah Hakodash the word kaf is not so good because it has a kaf kemutze, clenched fist and a peh peshuta, open mouth. We switch כף to פך having a peh kemutza, ckosed mouth and an kaf peshuta, an open hand. According to this, could be, שלום רב לאוהבי תורתך ואין בהם מכשול, מכשול is the same as שלום with a ‘כ’ in it which is not good.
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