Mine is actually disassembled right now, and it's very similar. I wen't crazy and used the Browning 303 flash hider as a clamp spacer. (The rings fit inside the grenade threading and the bearing fits the clamp)
grenade is currently out in the marketplace so it's a little sad to look at right now
Quick photo update. I'm currently working on finishing this grenade. This is after the rust (and apparently ugly brown flaking paint) were removed. I plan on blueing the steel and sealing it in the coming week
Turns out there is some sort of cement or thread lock in some grenades preventing them from being unscrewed. I heated mine over the stove in the process of cleaning out the innards and smoking brown goop started to seep out of the neck plate seal.
I had a bunch of these etched & powder-coated, which turned out to be a little tricker than we'd imagined at the start. I'm sorting out first & seconds quality right now.