While un-bagging Class-A BSC hardware, I inadvertantly mixed some regular dowel pins with specially-machined Undersized dowel pins (D1100684); these were 1/8" pins, but I can't remember whether they were the 1 1/8" or 1 1/2" length.  After I did this, I measured thickness of pins, but couldn't tell difference; will give this another try.

Other undersized pins have been kept in their Al pouches and are grouped together in the same container.