Or use a hand-reamer. Designed to widen holes so there's less risk of anything going wrong.
Build #1 ES-3 Build #2 EX-1 Build #3 Customised ES-1 in an ES-330 style Build #4 & #5 GSJ-1 and GSM-1 Build #6 GST-1 Build #7 Harley Benton JB Build#8 ES-1
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