Yes, you can use the current 6mm pendant tube and crown or drill and tap the case for the older 6mm crown with the larger pendant tube.
Having a damn hard time removing the crown tube from the 5517 project I'm working on (Raffles case). Jamming a round and/or square file in the hole isn't gripping enough, might have to use heat to break the epoxy/glue/loctite they used. Also working on a 5513 and 1680 at the same time, so was hoping to kind of "assembly line" the process, but stalled waiting for some of the parts to arrive.
Another project that's in the early stages is modifying a 2824 clone movement to take a gen Rolex dial without removing the feet. I THINK that it's possible to drill holes through the main plate of the movement that correspond to the dial feet and secure it that way, although I'm not certain...yet. I don't think my skills are up to moving the clamps, but just clearing the feet should be enough to keep the dial from rotating, and the case clamps should squeeze the dial between the movement and case, so it won't move in that direction. It's a work in progress. Just have to see if there's a clear path through the movement without interfering with any moving parts.
I broke the crystal removing the stupid wire/spring bezel, but that's just an excuse to upgrade. It's possible it was broken when it arrived, the damage was where it meets the case, hidden by the bezel assembly, but was planning on Clark's regardless.
Also looking, as a long-term project, into gathering multiple different versions of popular watches, and posting a comparison photos of each. I know it's been done before, but a lot of the threads are old, hard to find, or have photos that are broken links, or compare watches that have "evolved" since the original posts. Probably will do an Explorer and Sub to start, maybe a 1016 and 5500 Explorer, since I have the cases in gen and rep already, and maybe a 1680 or 5513 Sub, since I have those as well. Probably will do Raffles, Cartel, and Gen, maybe BP, TC, and generic AliX cases, and dials from Gen, Cartel, Raffles, Mochacha, Yuki, and DIY gilt dials to see what the differences are. It should help with case shaping and seeing which versions are easiest to do which mods on.
Again, this is a LONG term project, so hopefully will get started with what's available and add to it as I accumulate data. Not sure if it will be as popular as the newer comparisons, but we vintage junkies are a small, but passionate, group, lol.