My SWCC master clock is running pretty well except for one problem I hope someone can assist me with: The minute hand frequently runs up on the hour hand causing the two to lock or freeze up. When this happens the clock seems to continue tick-tocking but, obviously the hands don't move. The Hour hand fits onthe shaft with a colete (?) and a very small application of wood glue so that it won't merely slip on it's shaft. The Minute hand, of course, has a square drive and correspondingly has a square opening that secures it and prevents slippage entirely. My clock has a tiny brass washer that is concave or convex depending on which side you view it from and it, as well, has the small square hole in it's center to fit over the minute hands square shaft. My thinking is that the brass washer's purpose is to mount, possibly, between the minute and hour hand and preventing any chafing and to keep the two hand from entangling each other. Or does the brass washer fit on last, after both hands are mounted on the shaft, just before the threaded nut screws on and holds everything together? The function of the brass washer with the square hole is unclear to me and I am wondering where it mounts (sequenchaly) and which side (convex or concave) faces the room Lastly is it's purpose to somehow block the hour and minute hands from getting crossed on one another? Thanks for any tips to clarify this. Roger D in the nation's capitol.