"a b-stock mixer... the price is roughly 1/3 of what it costs new here in norway... hmmm, will it fit in an overhead storage compartment on an airplane

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that's a great deal for the Uk let alone Norway, if I were you Jorn I would get a cheap flight from Oslo to Stanstead, DV247 are just up the road in Cambridge, buy it and take it home....though it won't go in the overhead !!!!
I actually bought a b-stock unit myself and have had no issues whatsoever