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Looking for parts for Korg PitchBlack tuner

The nut and washers have come off my Korg PitchBlack tuner and disappeared. Apparently this is a common problem with this tuner. Does anyone know what size Nut and washers it takes? I went to a hardware store but they could not match up the fine threads.
 
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Input / output jacks and switches have a different size thread than you'll normally find at the hardware store, and, they're not all the same. If you have still have a Radio Shack or another electronics supplier nearby, they might be able to match it up.
 
The nut and washers have come off my Korg PitchBlack tuner and disappeared. Apparently this is a common problem with this tuner. Does anyone know what size Nut and washers it takes? I went to a hardware store but they could not match up the fine threads.
Did you manage to find out what size the nut is? I'm in a similar predicament!
 
it's highly likely that it's a 3/8-32 UNEF panel nut. but, i don't own one of these tuners. these type of nuts are very widely used in musical instrument and pedals. sometimes these nuts can also be found on input jacks from guitars and basses.

if you can measure the outside diameter of the threaded portion that is sticking out of the box with calipers that would help. if you can count the number of threads that are visible within 1/4" of length and multiply that figure by 4, this will give you the threads per inch.

it could also be a metric panel nut -possibly in the 10mm range.