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@velosaurus
If its a 142 frame then you need 142 adaptors and the frame will have the 3.5mm recess
If its a 135mm frame then there will be no recess in the frame drop out because if there was, the drop out would rub on the smallest cog on the cassette.
Only thing I can think with that is either a. You have drop outs designed to run 142 in a 148 boost frame by mistake or b. your frame has had the drop outs squeezed together. Which ever, its one for veloci to solve so I would ask them and point them to this thread?