Lens Repair

I had a surprisingly painless lens repair experience last night (so far). My canon EF-S 17-85 zoom was sticking halfway through the zoom range. It turned out it was due to a loose screw inside the lens that was catching. I tightened it up and put it back together. Seems to work so far. There was two tricky parts- there is a sliding brush inside the lens that must be there to communicate the zoom position through the rest of the lens and the to the camera that is easy to bend. The other tricky thing was the front optic is mounted on a sliding mount that adjusts focus (I assume). I marked this with a knife scratch before disassembling and put it back together the same way.

The brushes that are easy to bend

The brushes slide on the contacts on the lower left when the zoom is changed
The loose screw