b"h hi ari my name is moshe weiner from jerusalem i would like to comment on your lamed - the source of kav mashuch is from the beit yosef and shulchan aruch ch.32 regarding the top yud of alef and resembling letters that have yudin (yudei shin, ayin etc.) Rabbi Wozner in his shu"t Sheivet Halevi writes that a diamond shaped yud (something like the lamed you have) is not obvious kav mashuch. He concludes that although there is place to machmir, one that is matir such a alef is acceptable [his lashon is: אין מזניחין אותו] i dont know to translate exact, but it means one cannot disregard such an opinion. [if anybody can give the correct english for this - thanks] i understand his psak as fitting what you were told, this is a case of safek mashuch (or maybe R. Wozner indeed thinks that we dont have permision to pasel such a kav mashuch, but didnt want to openly meikal) second: there is a additional dimension of the law of kav mashuch, since the rishonim (beit yosef above) ...