Greetings all (especially Luthiers)
I need to do some setup tweaks on an unbranded O-hole. The truss rod requires a 4mm allen ball-head wrench, and is adjustable through the oval soundhole. Distance from the northern top of the O-hole to the truss rod nut is 6”. No possible way can I get my gorilla-hand inside the soundhole, so I need something like an 8” 4mm angled wrench, or (possibly better) a 7 1/2” - 8” allen key that affixes to a fine-toothed ratchet.
Any tips for buying such a thing? Thanks in advance!
(I’m surely not the first person to need to do this, but it’s also not a hardware store item, and StewMac doesn’t have anything that meets my dimensional needs)