Also, you can put a "hose" clamp on the fork, with the extra length just barely touching the wheel or the rotor, whichever you are checking for "warpage".
Also, I clean and slightly grease the two large top caliper bolts about every 3,000 miles to make sure the caliper moves freely. They tend to accumulate brake dust, etc, looking like old black thick greasey crud and then prevent the calipers from freely moving as they should.
