How to work with a small utensil when they are attached to the structure of the house.
more examples of "מבטל כלי מהיכנו" (nullifying a vessel from its normal usage) that come up on Shabbos;
Introduction to the Melacha of מבעיר (Kindling a Fire);
Understanding the Difference Between ממצא חפציך (Mimtzo Cheftzecha), דבר דבר (Dabair Davar), and הכנה (Hachana);