I just picked up a used Shuttle 3.0 8T here on TB (thanks Lomo!) I love the amp and see it being a great go-to for rehearsals and small gigs. However, one of the Thumbscrews is missing. Where can I find a replacement? I emailed the address on the Genz site but it sends you to some general Fender Consumer Relations and I never heard back from them. Any idea on where I could find one or something similar. Does anyone know the thread size or count so I could at least use a regular screw?