Step 10Intermission(2): Stuffyottahave
Layout fluid - fast-drying blue stuff to spray on metal you want to mark for cutting, drilling, etc.
Prussian-blue oil paint - $3 or so at the local hardware/art-supply store. For coating a metal surface you want to make Very Flat.
Eye protection - every time a chip of very hot, sharp metal hits my cheek at high speed, I say a little prayer of thanks that I'm wearing these. And I'm not religious.
My rule is this: when my hand touches a power switch, I am wearing eye protection. It is SO easy to think "this quick little cut won't be a big deal" -- and have a tiny piece of wood or metal shoot straight at your eye. They do NOT yet have artificial eyeballs on the market, as far as I'm aware.
If you touch a power switch -- you're wearing eye protection. End of story.
Learn it. Live it. Enjoy stereoscopic vision for the rest of your life. It's easy - and it's free.
Other tools -- an automatic center-punch - quite handy.
A 0.001"-accuracy calipers - almost necessary.
A "Dremel"-style tool - if you do everything perfectly, you won't need this. (And, if you do, please contact me. I have some walking-on-water jobs for you. ;-)
Finally, the FastSteel I've been mentioning. (See above comment on Doing Everything Perfectly.) It's an epoxy/steel-powder mix that comes in a stick. You cut off what you need, knead it until the color is uniform, and press it into place. It's certainly not as strong/tough as steel, but it's come in handy when I need to patch an area that just didn't cast well. It will take a thread, can be drilled, etc. I wouldn't trust it to hold me over an alligator pit in the place of real steel, but it's not bad when you need something more cosmetic and/or somewhat strong.
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I have a similar thought when a chip of very hot, sharp metal hits my cheek at high speed... "$#!+, that was close.. I should put the glasses on!". (I am learning! experience (or close calls) is not the best teacher in this case) That's good advice re the power switch.