Time to create a new thread for your "Tool Talk" guys.
if someone in 2 years time wants to learn about tube notching a thread called 'Comet Mongrel' is not the first place to look
Much as it pains me to write this, I have to agree with Cyborg. Over the course of 18 months on another forum I documented my complete rebuild of the 1928 Ariel I rode in last year's Cannonball.
If I hadn't included "off-topic" descriptions of my Magnaflux unit (forks), electroplating baths (Cu to increase the interference fit of a bearing), TIG welder (Stellite to fabricate push rods), lathe (coil winding to rebuild the oil pump), etc., the thread would be much the worse for it. I'll immodestly say that if anyone is contemplating the rebuild of an Ariel of that period they'd be hard pressed to find a better resource than that thread, in no small part because the discussions of tools in it makes it so comprehensive.
I'll suggest that not many people would even look on this site for information on tube notching. They'd look elsewhere. A tools thread all by itself might be interesting, but incorporating the tools within threads like Cyborg's is interesting.
That said, I'll admit that our digression into self-tapping units was just us having fun and has nothing whatever to do with the thread.