AVS Special Member
Join Date: Dec 2007
Location: Southern California
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Actually, that 6.35mm is normally referred to as 1/4 inch...lol.
I would get some small pieces of 1/4 inch wood dowel, maybe 1 inch long, and just insert them part way in the hole when it is not in use. plastic would also work fine if you can find the right size rod and cut it to length.
You could even take an unused phone plug and cut it off very short and put it in the hole.