I think I got you covered on another forum.
For those interested, in order to disassembly these older Colt cylinder assemblies, you need a special ejector wrench and a hollow crane bushing spanner wrench.
The ejector wrench is a flat wrench with a hole that fits down over the ejector's ratchets and is used to unscrew the ejector without damaging either the delicate threads or the ratchets.
The ejector rod is retained in the crane by a threaded bushing that's in the rear end of the cranes shaft.
A special hollow spanner slips inside the crane and around the ejector rod, and is used to unscrew the bushing, releasing the ejector rod and spring.
I DO NOT recommend doing this, especially without the tools. These old style cylinder assemblies are very easy to damage during disassembly and reassembly.
Once damaged, replacement parts are getting VERY difficult to find, and there are very few people left who still work on these older guns.
In any event, without the special bushing wrench, you can't get the bushing out.
Although Brownell's do sell a hollow spanner for the "D" and "E & I" size Colt's I don't think it fits the bigger New Service models.
