Listening to poor Ed and wife’s travails hunting that diamond, I
must offer a better suggestion in case there’s a next time. Rather
than stuffing a towel in the vent, which I assume should still Be a
vent, put a fine mesh screen in the opening. If anything disappears
on the floor or dark crannies, the easiest way to find it, unless
it’s in your shirt pocket or pants cuffs, is to get out the family
vacuum, insert a brand new bag or filter, and start "cleaning"
anything that isn’t nailed down. All you’ll have lost is one vacuum
bag that will be cut open for inspection and retrieval of your
flying diamond or whatevers. And, your shop will be much the better
for it, as will your wife’s hands.