The 1/8" variation is larger, not smaller. I include a table in the Randall Ordering FAQ that covers this, specifically Item I-4. See: http://lundestudio.com/RandallOrderingFAQ/I/4.html
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Ken Lunde
RKS #5344
SHAG #1
#4-6-6-SS #2
http://lundestudio.com/RandallOrderingFAQ/