Hi, I am a huge fan of this forum, and used it in selecting my new stringer. A Gamma Progression II. Once I completely built it though, I noticed something weird, one of the clubs near me has the same machine but its frame support posts were a darker metal and it had a little twist knob to move them back and forth like this one: Mine looks more like the one found on the gamma website: I ordered it from tennis warehouse though: The only visible difference is the shape of the frame supports, on the dark metaled one, and the tennis warehouse one the posts curve in, on mine and the gamma site's one the posts curve out as if they were flipped over from the other ones. Also since my machine does not have the lever lock bolt i have to tighten and loosen the nuts in the machine, which works, but is inconvenient. In addition the manual that came it has the curving in poles, and the lever lock piece in the instructions. I built it using the: "NOTE:2 pcs. of M10 cap screws are provided ... in event that the lever lock bolts become inconvenient..." Any idea why there are two posts, and anything helpful about the lever locks would be much appreciated ! Thanks!