A SD Insert has smaller inner and outer Diameter.
Also a SD Crystal has a smaller diameter than a Sub one.
I think you have a Sub Insert a SD one is too small for a Sub.
To fit a gen Insert is not that easy, it need some force to clip in.
I think it's the usual issue on a Rep Bezel, the Insert needs to grind a bit?!?
So the pin don't go to the inside of the case. There is nothing to seal.
Shure I can do a tutorial but its so easy to do. Take a hammer and small brass pin that have the same diameter as the "Valve"
Than put the brass pin on it and pull it with the hammer a bit in the Case that's it.
Very easy to do.
it's not in Freddy's tutorial.
If u look on my 1665 in my signature u can see that I pulled the "Valve Pin" a bit in the Case.
You can take a small pin from brass and a hammer to pull the pin a bit deaper in the Case.
There is not much force needed.
This is why I called it " The easy HE Valve Mod"
I've done it on several 1665 I modded for some members.
I have modded several MBW 1665. U are right the HE Valve looks etched.
But it is a metal pin in the Case. U can drop it in with Hammer.
The easy HE Valve Mod
Look at mine 1665.
For the understanding Case size is similar to 16610, but it use a smaller crystal (same size than SD) also smaller Dial (also same size as SD )
The insert is also smaller and can be used on SD too.
So the mystery is solved.
I think it's not worth, too much worth than good things.
The one piece Rehaut is nice but I don't believe a gen crystal will fit.
Dial seems to be nice.The rest looks crappy to me.