I just posted this in response to a post in racquets but it probably fits better here. Last year I switched from from a bigish/light racquet to small/heavy in order to reduce some wrist pain. So far so good in that it doesn't get worse but I just can't bring myself to take any time off. I play 2-3 times a week usually consisting of 2 group workouts with lots of drills and a 3.5 league doubles match. I use Advil and ice to manage any pain which is probably compounded by a lot of typing. I play with a Vantage 90" at 63 flex and about 12.5 strung/gripped. In the past I have used 100% nat gut at 60lbs but found it to be a little more powerful than my flat, low percentage tennis game allows (yes, yes take lessons, hit more topspin. The mind agrees, the body does not follow). I switched to a hybrid putting poly in the crosses to tame the gut some. I use either the Vantage brand (really quite good IMO by the way) or Big Ace. It's a really great setup except for the obvious durability issue. I never break stings but the honeymoon for this setup is pretty short. So, back to the question. At what tension do you think gut loses it's arm friendliness? The recommended range on this frame is 55-65 but I've not gone over 60 with gut because I figured it loses any benefit in terms of comfort at higher tensions. I'd love to ditch the poly so, does anyone have experience using gut up in the 65 range on a mid?