Pythagorean Theorem Base with Screwholes

The small tabs to keep the square and chain on the base kept breaking off my base, so I modified the base to add holes just large enough for 2-56 size screws instead of the tiny tabs. Only the base was modified. Use the chain and square print files from the original Pythagorean Theorem project by mshscott at http://www.thingiverse.com/thing:245202