Wanted to ask for some opinion (and perhaps perspective) here...sorry for the long story/explanation. So, I am doing some stringing this week for a challenger level event. Just me, I'm the only stringer on site for the 9 days the tournament plays out (qualies + main draw) The player I am/was stringing for brought the racquets to me and asked me if I would be willing to help manually pre-stretch the half-set of gut they were using. I said sure, no problem. We wrapped the ends of the string around some wood pegs and we pulled against each other to the point where we could feel (and see) the string elongate a little, then contract back to it's original length. This took the coil memory out of the string and stretch it a little - the desired result. We repeated this 2 or 3 times each time we manually pre-stretched the length of gut. Then the player gave me the desired tension for the gut (mains only) and also asked for 5% pre-stretch by the machine (Prince 5000). I carried out these instructions while stringing the gut, then installed the crosses (Bab RPM Blast at the same tension as the mains). When the player picked up the racquet, they had one of these with them: (http://www.tennis-warehouse.com/descpage-ERT300.html) which I have no problem with - if players are into understanding and measuring the dynamic tension of the stringbed, good for them. The problem for me was, if the dynamic tension didn't read within 2 (points? not sure what the unit of measurement is called) of what they wanted (which happened to be 41) - the player would take the racquet but refuse to pay for the stringing service. The first racquet was fine (dead on at 41) but the 2nd racquet came in at 46 and the 3rd came in at 37, which was "not playable" - the players own words. The problem is - I repeated the exact same process every time with the machine (same tension, same installation, same pre-stretch at 5%) so I don't see what I could have done any differently. Anyone else ever encounter this kind of situation before and how did you handle it? I ended up having to have a talk with the player and told them that they needed to pay for the stringing service regardless, and that I wasn't going to just let them keep taking their racquets and paying only if the reading from the device was "acceptable" to them. Plus I didn't exactly enjoy feeling like I was stringing on egg shells each time I was doing their racquet.