"I don't really have a normally. My previous projects worth the name are- The pressure cooker, a new automaton routine, improving the orphanage's furnace, fixing a broken lamp - I barely count that, it was just a loose wire, only I maybe knew exactly what the problem was without checking? - And some old toys I made before my mom d-died that I don't have anymore... Um, the tool-arm I'm thinking would be made on commission, yeah, or join my toolkit. My thought when I chose it was, um, I wanted to mimic automata arms and get a better understanding of prostheses," and it was COOL, "I need to change the idea to make it more practical though. There's not the heavy stuff here for a large work arm, but a really little, really delicate one for working on jewelry or something, that would be useful going forward."
It could have TINY KNIVES and maybe a SUTURING THING, that would crawl along disturbed skin smart-quick to fix it up, sewing machines can make very fast stitches with a clever little wheel, that piece she saw out of the corner of her eye IS such a machine's doohicky, so why not sutures, not that she really understands medicine but she's done sutures on George when he split his head on a rock- "Hmm, and a thin tube to dispense disinfectant perhaps? Tiny, steady tools might be wonderfully useful for medicine now that I think about it, though I'm not a doctor and it kind of grosses me out... Hold on. Hmm."
It's stupid to just go with the first thing that pops into her head, no matter how COOL it would be. Maybe if she were playing around or relaxing, but this is serious. Work. Self improvement. Come on, isn't MAKING MONEY cool? Think! What else could the articulating arms become? Some sort of prosthesis? They're not that strong, not that sturdy. The lenses themselves are mostly good for getting a close look at things, or perhaps you could direct a filament's light all in one direction with mirrors and lenses? She read about diffraction, it won't keep going forever, but that'd still be handy. Maybe something to reach and pick items off distant shelves, to inventory-keep, though the useful part of that one would be all in the automata-controls, to control what to grab and when. She's not thinking of all that much to use them for, they're just too small! But if you break them apart, what do you have? A bunch of smoothly adjusting rollers that can lock in place, some lenses and levers and tiny adjustment-arms and clamps, and brass rods.
Her mind wanders, picturing a cooking-automaton. Thin clawed limbs from above scoop and mix flour and nuts, beating it for however-many cycles before flattening, cutting vegetables and adding water- There's no MOTIVE FORCE in this thing, it's entirely PASSIVE, which just isn't good enough! Even for her tiny-tools idea, she's going to need ways to apply force to the rotors. The balancing they have going on is wonderful, she doesn't want to be bothered by the weight of whatever sticks on the end, tiny adjustments for tiny motions- Wires in tension, or string in tension at the very least-
"I should probably make a bunch of SKETCHES to work out the best way to hold it together." And as for the actual arms on the end, she'll need to shape them into a hand-of-sorts... All she has useful for this from the orphanage is the cooking ball (the tiny boiler inside would be enough for a small tool like this with the right sort of conversions...) and a small bag of hand tools. What does she need? Metal and wood pieces to carve, string and wire, little springs to hold the tension just so, gears to translate the motions down in scale- She'll need tools to actually go on the end, maybe a little saw or sandpaper wheel or drill? And a way to get power to them in nice, safe amounts, that means either some sketchy business with tension or twisting string and wire, or more electricals, copper wire, and either expensive standardized parts or improvising them with lead and acid and wool or whatever else, electricity is SO INCREDIBLY FINICKY but she'll be able to figure it out, you'd need something to coat the wires with and woven wool still catches FIRE sometimes and rubber is expensive but it comes from a tree so maybe you could make something else into rubber, life is just chemistry in the end, honestly the twisty-wire might end up being easier even though it sounds very delicate-