Cool!
There are some of the old style folding rulers that have an extendable piece in the first end piece that enables you to do the same thing. I've got an old Craftsman version. It looks like they are still available new too. I see Lufkin, Klein, and Wiha on Amazon.
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Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa
SOLD 2004 - gone but not forgotten