Mono or stereo input jack.
The Allparts long threaded barrel input jack, stereo, Switchcraft #152B with nut and washer can be wired mono or stero and accepts a 1/4" plug. It requires a 1/2” diameter hole and at least 7/16” wood thickness for mounting. The short post is hot, the medium post is for battery and the large post is for ground. Overall length is 2”.