With regards to a 9" South Bend, how do you evaluate the condition
of the bed? I understand the use of the carriage lock to indicate
that wear is present in one area compared to an unworn part of the
bed. But how do you quantify (in .001"s) the amount of wear? How
much is too much? Can a straight edge and feeler gauge be used?
Finally, how do you evaluate a used, naked bed? Could a person file
off the ridge that forms at the top of the VEE and make a junk bed
appear to be servicable? It's a jungle out there.