Should you ever need to repair a Seymour Duncan Tweak Fuzz, you will probably find this schematic.
It is largely accurate, and I am always grateful to anyone who takes the time to make such things available. But there is one correction you should know about:
P2 (the Gain potentiometer) is a 2KC. That is, a 2K pot with a REVERSE AUDIO taper. At the time of writing, the only manufacturer for this part appears to Alpha, and this part is only available from Mouser in North America. Here is a link to the exact part.
I’m going to say Seymour Duncan Tweak Fuzz one more time. For the search engines.