It wouldn't be surprised if there were say, one or two degrees intentionally biased, regarding the face of the knuckle casting,
in order to keep the extrusion flat on the table, when it's cinched down.
Perhaps that might partially explain why there is such a error... and should this be the design,
it could well be that the holes drilled for the profile connector should have been done before said milling procedure,
instead of after, and those holes infact should be parallel with the fence rail/table, but aren't.
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I'm sure the folks at Felder, or indeed prospective buyers of such, would appreciate seeing some more pics.
and if you had some suitable threaded rod or long bolts, it might show this up, should such a systematic error be evident.
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Such may be worth noting, should you have only offered a square to the knuckle face, (without the extrusion attached)
Likely wishful thinking, but worth a shot.
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All the best
Tom
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Tom Trees