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@gbj_tester
42mm chainline is going to be pretty close to the middle of the cassette on a 130mm OLN hub with 7/8/9/10/11 sprockets, a couple of mm either way won't matter. The important factors for getting the chain to stay on a single chainring are adequate chain tension (i.e. set the chain length right and don't push the envelope with dérailleur capacity) and use of chainrings specifically made for single use, with no lowered teeth as found on outers for double/triple sets. Riding slowly on fat tyres helps, which is why Ed hasn't had any issues. The people who unship chains are old school testers with very high pressure in the tubulars, so no suspension, and hitting bumps at high speed while pedalling