throttled cylinder sleeves, mufflers, QZ, QRC etc.

Please post pictures up close, operating, cylinder types and general information in regards to these styles of engines. My father never discarded anything that was pertinent to a engine. I found a bunch of parts for Cox stuff such as mufflers, timing shims. The shims are aluminum and he had them wire tied to a few mufflers.They fit the bottom of the cylinder to jack it up off of the case to delete SPI. There was another washer much like a glow plug washer but aluminum. This is for using a muffler on a TD which jacks up the venturi so that it clears the muffler.

So what I found was a Golden Bee tank and the top of it had a rabbet filed into it so that the muffler cleared. It actually has a pin hole that's leaking where he filed it. I put some JB weld on it for now. I have about 4 Babe Bee engines which are dual ported #1 cylinders. I believe these are actual QZ engines. I want to put the mufflers back on these engines but the muffler seems loose on it. This is the style muffler which is aluminum, with a hex base, and the spring steel clip which rotates around the circumference.

In addition to what I believe is the QZ is some engines with a #7 cylinder. One has a throttle sleeve on it. I ran the engine and it started easily however I didn't have much throttle action. It did run quieter in one position vs the other but it didn't do much for low speed and high speed seemed slightly delayed. I was swinging a 6x4 on it which could be responsible for the somewhat high speed delay. The sleeve isn't as tight as I think it should be. Honestly, I never really used these as it was control line always.

My#7 cylinders are stepped wall cylinders. There's no bluing on the surface that the sleeve rotates on. Now I also have a thick walled cylinder which has it's entire surface under the exhaust cutout non blued for what I believe is also for a throttle sleeve. I would like to see a break down of some of your engines if one is inclined to post some pictures.