Yeah, what you can get away with on a rack is less than on bars, but I don't think you can realistically achieve "non-air-gap" accuracy with hand tools full stop.
It is doable, John at chickens frame emporium showed me a mitre he had just done when I was up there a while back, you literally couldn't see the join it was so close. Impressive stuff.
Yeah, what you can get away with on a rack is less than on bars, but I don't think you can realistically achieve "non-air-gap" accuracy with hand tools full stop.