The difference between the two measurements (error) is actually 1/8" Darryl, 10-1/2" minus 4-3/8" = 6-1/8" and I do believe the more recent dimension is correct @ 6". There is a little bit of guess work in locating the hole centres with the large countersink but I'm sure I'm right at the second attempt as I used a slightly better measuring arrangement.
Apologies for any confusion.
Dave
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Hell no! I'm not that old!
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