WolfishMusings,
“So, by doing so, for years, I have been mechalel Shabbos every time I davened for the amud on Shabbos mincha.”
Did you read the rest of AviraDeArah’s post?
Even if it turns out to be 100% hachanah and assur, or worse, the bookmark sent wireless signals to a remote controlled robot programmed to start every car in the parking lot, chop and gather wood, and sort all your kids’ lego by color when placed in contact with the first page of the weekday maariv, I think you’ve received a blessing with your realization. We are supposed to keep growing and improving ourselves, and you have an opportunity to do just that with a very small but meaningful act.
There’s a well known story of a chossid who had a precious set of tefillin written by a renowned sofer, who was makpid to get them checked frequently. When he was elderly, a routine check revealed something that meant the tefillin were always possul, like a misspelled word or something. His family expected him to be crushed – he was so proud of and careful with the mitzvah of tefillin, and now it’s become clear that he’s never fulfilled it properly in his entire life! Instead, he started dancing. He told his family that, no, he was not out of his mind. But rather, for some reason, it had been ordained that he not get the merit of fulfilling the mitzvah of tefillin, but Hashem had now given him the opportunity to do so before he left this world.