Just got back, they adjusted it in just a few minutes. It did do the slipping while on the stand, so they were able to see what I was talking about. It was just cables stretching, so they tightened them up.
The bike shop is in chesterfield valley; miles of flat, wide, bike friendly roads, and it was in the low 70's. Although I only had about 20-30 minutes for lunch, I went for a ride, couldn't resist it. No problems with slipping. It was very windy, so even though it was flat I still had to work going out, but coming back I could relax. What an enjoyable way to spend my lunch break (with the trip to the shop, the ride, and the trip back, it was too long a lunch break, but nobody noticed).
vickie