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I can wiggle my caliper and get various readings, hence its crapiness
It's Christmas, treat yourself:
http://www.mitutoyo.co.uk/small-tool-instruments-and-data-management/calipers/500-737-10:-)
gbj_tester
I can wiggle my caliper and get various readings, hence its crapiness. An adjustable spanner may be a good idea then since you don't need the wrench to be a thin profile for the headset?