Eugkim, Have you seen any improvement in #2 or #3 after a few more tries?
Yes, there has been significant improvement in both. I just strung my 3rd racquet tonight, and there was minimal drawback. The single action also got a lot easier, probably a combination of use and holding the bottom of the clamp with my palm and using my fingers to open and close; doing it this way, there is minimal catching on the rail. My time went down significantly.
Some concerns I had about the ML100 before purchase:
-speed of drop weight, which is not an issue. I think I can string as fast as I did 23 years ago with time.
-mounting system, not an issue. While somewhat cumbersome, it is very solid. It has options that seem to allow for custom fit on many different racquets (ability to change teflon adapters, fine tuning of the 12 o'clock position). Even the Crossbows (my family has 3) aren't a problem. The hooks are a little bit of a pain, especially if you tighten them down. As the hook bends around the edge of the racquet, the long portion of the bolt binds on the machine, and is difficult to loosen.
-the stand. It's solid as a rock, and I'd recommend it. I got the ML100 over the ML120 because I wanted the ability to take it off the stand if needed, but I don't have any real intention of doing so frequently. The only benefit I can see with the ML120 over the ML100 is the option of getting the Concorde system.
- T92 clamps. While I was initially disappointed with them, I really like them now. The only time they're tough to use is on the first 2 mains on each side. If you clamp very close to the frame, the clamp is at the end of the rail, and it tends to bind. It takes some effort to free it, and I've pinched my fingers once or twice so far. If there is some open rail left when clamped, this doesn't seem to be a problem. I'd probably do fine with the T98s, but I love the T92s now.
- drawback. As I said above, for whatever reason, the drawback was minimal today. I tightened the clamps a hair; maybe that did it. I also tried loading the clamp, setting it prior to tightening by pulling away from the direction of the tension. I got the advice to do the opposite, but it stood to reason for me that, if there is a bit of play in the clamp/rail interface, take as much play out before tensioning, and it should hit the most stable position once the tension hits. By pulling in the direction of the tension, you're maximizing the amount of play available in the clamp/rail interface. Also, I found that, by pulling away from the tensioner, I was also locking the clamp teeth against the mains, further eliminating the play/drawback.
- lack of 360 - this wasn't a concern for me, as I have no experience with a machine that has it. I know some people prefer it.
So, my take at this point is that I'm sold on the ML100. I'll be stringing for myself and family. My son wants to string for money, but I doubt he'll do more than a couple racquets a month. This is more than enough to fit my needs.