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Because if you need half a dozen 1/4" hex spacers, 1" long, then of course, the sensible thing to do is get some 1-1/8" spacers surplus (saves money!) and cut them down. Not, like, find some 1" long ones (it's an off-the-shelf size), and just buy them. And if you need a dozen matching 6-32...

You may also want to try this guy -- he caters to people keeping model airplane engines alive, but he says he makes stock and custom rings. https://rmjmachineworx.com/online-store I think if it was me I'd call him with an approximate bore, and see if he's got something in stock that comes...

I think you're right -- with some lag for folks to wrap their heads around the new-fangled spinny fastener technology.

I wonder if you could achieve that second cut by lapping the outside of the rings. The tool would just be bog-standard outside lap, which you could whip up in an hour.

Y'know, I'd suggest that you make a test setup that lets you test one valve -- maybe with your setup above -- and just experiment with making valves work. Don't think of it as "money wasted failing to make an engine", but rather "money well spent learning how to make valves". When you can...

That link that I posted for you links to two or three different methods of making rings, at least one (and I think two) of which have you compressing the split rings, clamping them into an arbor, then turning (and maybe lapping -- it's what I recall, but I'm too lazy to go read the articles) the...

http://modelenginenews.org/techniques/piston_rings.html

Wait -- all the hot rod engine assembly instructions I've seen say to just line up the witness marks on the cam gear and crankshaft gear. Now I'm confused 😁

Ditto on making the parting tool face concave on top. You can do this with a Dremel Dangerous Disk if you have steady hands. The resulting tool isn't pretty, but it does keep the chips from sticking -- and you have to be a good friend before I'm going to let you into my shop to inspect my tools.

Hey Pete: Understood -- and I should have pointed out the various Morse (and other round) tapers in my original post, as well as the fact that in a lot of ways a tight screw and a tight wedge are doing pretty much the same thing at their mating surfaces. I'm really specifically referring to...

Made in the late 1990's, or 1890's? (I mean -- I think I know what you meant!)

It does seem to be the thing to consider if you're looking at a two-year engine building project and thinking "dangit, I wish this was going to take me a few more years".

I'm surprised you were seeing rust on something that was totally immersed. Generally rusting needs free oxygen. I've never had steel rust on me when I've been cleaning it with soapy water, as long as I dried it and oiled it immediately.

My understanding is that back in the Before Times, quite a while after it became unnecessary to do animal sacrifices to insure the fertility of your fields, but before you could order 3D printed parts over the Internet, machines were fastened together by tapping wedges into slots, rather than...

Depending on the job, CA glue works well (AKA "superglue", but get at least hobby-store stuff). It's strong in tension, brittle in shear, and sets up in no time flat. So you can glue a thin workpiece to a flat face, then pop the piece off with a light rap of a hammer. I'm not sure of the best...

A two-part epoxy or urethane finish might do. I think there's even a rattle-can epoxy that you can get. I only saw it on a model airplane forum, so I can't remember whether you do something special to activate it, or if it gets mixed when you buy it. At any rate, once it's activated you have...

First: Gotcha on the function of the bellows -- so if you did anything to increase friction, you couldn't touch that. Second: Twin-needle carbs, as you describe, are the current "bog standard" for RC planes. 20 years ago they were cutting edge. Now, it's only the most entry-level of entry...

Just looking at a picture of one, it appears to be a bog-standard RC carburetor. Does the throttle arm come off? If you replaced that bellows seal with a right-sized O-ring, or put a spring inside it you may be able to add enough friction to the thing so it'll stay in place. (Or throw the...

Does the fan keep it cool enough? It looks good.

Your production department should have a word with Engineering about that.