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Yup, many a time have I duck taped a cordless drill to a bench with an item in it, and then used a dremel/die grinder to 'precision grind' the item down to size.
A mate donated me a 1950's old school british engine valve grinder instead, is very precision but only for valves with a stem of 5 to 9 mm!
Progress on the Pashley Pronto - the "old school" BMX headset is a Mirage MX-4, which is a copy of a Tange MX-2.
The cups are supposed to be 32.7mm OD but came out a tad bigger, just over 33mm.
I used my Dremel to file them down a bit and they now fit fine.
Another mild issue is the length of the headtube - a standard headset press is a tad short so something to keep in mind if you plan on doing it yourself.
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