Long story, but I had someone in the other day who knocked over my Calumet Monorail sitting on a Tiltall. The camera was fine other than it broke/stripped out out the tripod mounting hole. My thought on fixing this was possibly to drill out the tripod mounting completely, epoxy in a steel bushing, and then drill and tap it correctly to size. I've heard two conflicting reports on the thread size for this. Some references suggest 1/4-20, and the screws in that size I have seem to screw in fine. I've seen others suggesting it's a Whitworth thread, though...I can probably make some calls and find someone who MIGHT loan me a Whitworth tap, but obviously I don't want to go that route if it's not even correct. Does anyone know this for sure?