It's the best form of mental therapy for me. In my day-job profession success with most problems comes at the end of a long river of constant failure. When I am truly stuck, and all progress seems hopeless, a short escape in the shop often makes all things clear. I've lost count of the times I've finally solved a hard problem while mowing the lawn, scraping away on a stock, or doing some menial physical task. I think the reason why it works is that it provides an equivalent re-direction of sorts and a mental release. Smithing of this sort requires equal focus, but in a way that diverts attention to the hands.
All mathematicians are aware of a thing called a "really good, bad idea" - ideas that are so promising you invest all of yourself, mind body and soul, in the approach, only to find out weeks, months, or years later it's a dead end. But it was so good and so clever it cannot be forgotten. The effect is any subsequent idea ends up in a logic circle right back to just rephrasing the original dead end. Finding a solution now requires a great purge, only accomplished by putting it down for a very long time and moving on to something completely different, or with massive amounts of alcohol. I'm too old for the latter now, and time spent doing this kind of project greatly speeds up the former. Apologies - I'm a romantic at heart.
Sorry for the delays. I've been busy. Slowly making progress on building my checkering cradle for next steps.