I have a DC power cable that ends in a 5.5 x 2.5 mm plug. I purchased a panel mount jack for it, and yes, the plug fits. However, the barrel is much longer than the jack, so the barrel does not fit flush, which seems like a bad idea.
The barrel length is about 12 mm.
The panel mount jacks I see online seem similar to the one I have. How do I find one (a spec or search term) that will have the right depth?