I am using carriage bolts to build a replacement play set for my kids. The old play set (which came with the house) has a number of specialized "washers" which go along with the carriage bolts. The washer has two unique features:
1) instead of a round hole, the hole is square and sized to mate perfectly with the square portion of the carriage bolt shaft.2) the washer has a couple of spurs (like a tee nut) which prevent it from turning once the washer is drawn tight to the surface of the wood.
I think these washers are nifty, and I need more of them for this project. I've tried Ace, Sears, HD, Lowe's, Menard's, and a couple of local builder's stores with no success. In fact, the workers there have never seen one of these before.
Please help!
Thanks, Scott