How To Tighten Input Jack?

Joined
Aug 3, 2010
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Hi folks,

What tool or method do I need to secure the external part of the jack input of my Thumb bass in order to tighten it?
If I try to tighten up the nut from the electronic cavity the whole jack input is rotating...
I saw in a Warwick custom shop video a tech blocking the jack with a sort of "screwdiver", but I not sure what tool it is.

Thanks
 
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