Man, my buddy ran into the exact same thing last season, swore by his 12 inch brush for years and couldn't figure out why his arms were toast by noon. Switched to a 10 and said it was like night and day on those 13x13s. I've been going two inches under on the tile since I started and it's worked out fine for me.

The part about Ray saying "you know the library on 5th has two of those" really gets me, because that is a shop owner turning down a sale to help you out. That is rare. My question is how did the library handle the whole lending thing, like did you have to put down a deposit or show ID or anything, or was it just walk in and check it out like a book? I ask because a lot of people hear "tool library" and assume it is a hassle or that the tools are all junk. You said you borrowed a floor nailer and a tile saw twice, so it sounds like they actually keep decent stuff on the shelf. And the $20 a month thing, was that something they asked for or did you just decide on your own? I am curious how the money side works, because that seems to be what keeps these places alive.