I posted the answer to this exact question on the "Randall Ordering Knife Questions" thread a couple of years ago, after asking Dirty_Water (Blade Show 2017).

short answer:
Quote:
If you order a model that defaults with thumb notches (like, say, Model 5) and add a double-hilt option, they will build your order without thumb notches.


Longer answer and subsequent discussion:
http://www.knifetalkforums.com/ubbthreads.php?ubb=showflat&Number=161005#Post161005
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Rob