Help! Just finished my Helder TA2020 MKIII and I'm getting buzzing

I finally got around to assembling my Helder TA2020 MKIII and finished (99% done) it today. Thus far it sounds fantastic, though I am having one issue. This may not be an issue as I still need to buy knobs for the pot and switch, but when I touch the pot adjustment post I get a not extreme, but noticable, buzz or feedback through the speakers.

This is my first project attempt at a DIY amp of any sort and I'm not above stupid mistakes. If anyone has any idea as to how I might remedy the problem I'd love to hear some suggestions.

Thanks,
Chris

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my guess is that you need to connect the body of pot to ground. it should have come with a ground lug, a round piece that goes over the axel of the pot and has one end with a "pointy tip" on it. solder a piece of wire to the tip and connect the wire to ground. mount the lug on the inside of your box but on the volume knob axle itself and i suspect you will find that this will make your amp quiet.