I’ve purchased several tools from MTB and they have all been good. The headset press has been in use for a dozen years or so, no problems.
Am pretty sure that others have copied some of his designs, possible that the execution on those was not as good.
He has also made me some custom stuff, including adapters to make recessed nut frames accept nutted brakes, and some spacers for installing a six speed HG cassette on a later 120mm hub.
Good people.
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Hard at work in the Secret Underground Laboratory...