Thanks for sharing your experiences on this forum, and I'm sorry to hear you are having issues. Hopefully those who participate in this forum can provide some feedback and possible solutions for you. Here are my thoughts based upon what info you have provided thus far.
I obviously cannot comment on your interaction, but this has not been my experience at all with Mr. Timmer.
I am not certain, but is the warranty transferable to a second owner? Is it the sliding of the clamps what you wish to have addressed under warranty?
I can understand your frustration, and it is always good to conduct due diligence before making such a purchase. There are a number of very happy Stringway customers, and regardless of manufacturer or machine model, there unfortunately are always some users who experience issues and concerns.
Yes, please post the video so those in this forum have a better understanding of your issues and can hopefully provide some good feedback for you.
I'm a bit confused on this one. First you indicate no issues could have occurred during shipping, then you imply the product is too sensitive to withstand shipping.
Is this inherent defect the same as the issues you reference?
Issue 1:
The advice from TennisCJC is good. Most of us have the same turntable and clamping system as you without the electronics, so seeing what you are doing will be helpful for suggestions.
Issues 2:
The Stringway user manual recommends you push the clamp in the direction opposite the tension head before clamping off to reduce drawback. To do this with the T98, clamp off the string first, then push the base toward the tension head before clamping it off. I do this and it works well. Here is a screen capture from the manual:
While the pics show the T92 clamps, the process I mentioned above works for the T98s.
Issue # 3:
I would presume that mounting the clamps to the glide bar as recommended by the manufacturer is best. If it is not working well that way, there is some other issue. Did the seller mention anything regarding this? Have you asked them what they did? If there was ever any damage? If you are not already doing so, make sure you move the clamps along the rail by grabbing the base and not any further up on the clamping mechanism. (See the same diagram from the manual referenced above.) Also, if you have not done so, clean the rails thoroughly with mineral spirits and then spray them with silicone. I purchased used and once I cleaned the rails, the clamps slid beautifully...even better with silicone.
I can certainly understand that a manufacturer cannot fully endorse assembly/operation of their product when it is done differently than designed, nor predict the associated results.
I have been extremely pleased with my investment in Stringway. Even though I am the third owner, it functions just as I expected it would, and for me it is money well-spent. I know you are likely not looking for additional expense, but if you believe your issues with the fixed clamps cannot be resolved, you may want to consider flying clamps. I purchased them, and depending on the situation use exclusively the fixed clamps, exclusively the flying, or a combination of the two.
Post that video and hopefully the members here can share some great ideas to get you on track.