Hi folks, I've been lurking TT for a while and just recently made an account - some of my questions cannot be answered merely by searching. (Or perhaps they can, and I can delete this post!) I picked up a frankenstein dropweight machine about 18 months ago on craigslist and have been stringing my frames frequently since then. I've learned a lot about quality string jobs, especially minimizing tension loss! Major landmarks on my journey have been: adjusting clamps properly, minimizing slack when tying knots, avoiding flying clamps and using fixed clamps whenever possible, buying a starting clamp to get the mains started properly. Oh and a big one: Putting the dropweight on in the right direction, so the damn arrow is pointing at the correct tension on the rod! Yikes, strung quite a few rackets with 13 lbs less tension than intended, this was a major oversight. I blame the craigslist seller for that one! Some details about my machine, which came from an old grandpa who must have coached tennis for some time. The mounting system is from a Silent Partner e.Stringer SC (photo). The baseplate has been sawed off just past the swivel base, then bolted down to a standard Klipermate drop weight machine (photo). The result is a machine with a 6 point mounting system, one fixed clamp, with a dropweight tensioner. I like the idea and admire the grandpa for his work. I'm guessing the electronic stringer crapped out at some point and was replaced with the trusty dropweight. I can post photos later this weekend, if the idea isn't clear. Anyways - I've been using my single fixed clamp for everything, and I'm starting to worry about it. It's a cone-lock style, and when tightening it against the rail, it will slip if not extra tight. I have to pay careful attention to the angle the swivel creates vs the tension on it: if the string's pull isn't directly into the clamp's base, a torque is created, and the clamp will slowly rotate out of place. This is worse when the clamp is tightened against certain areas of the rail, ie, the middle area has some recessed bolts, and this offers less surface area, or perhaps doesn't have a perfectly flat surface. Anyways, the cone-lock mechanism feels flimsy and gives out on me quite frequently. Even on the "good parts" of the rail, it's an issue. It sucks to release tension and have the fixed clamp MOVE on you. I often tighten the clamp so much that it's hard to release. My questions: -Do you see any straightforward way to replace/upgrade the fixed clamp? -Can I buy a new, identical, cone-lock clamp? -If so, which manufacturer should I look to? I suspect the Eagnas cone-lock clamps are the same as the Silent Partnet ones, they look the same, but I can't be sure. -Are there known compatibilities I can leverage to replace the cone lock clamp with a better one? I suspect I'll have to measure the rail quite carefully to see if a better clamp would fit. Here, again, it would be nice to know the origin of the Silent Partner clamps, and if they are identical to another more common brand. -Is it the case that cone lock clamps are just nasty in general, and an upgrade won't save me any effort? Thanks for the help.