Loose crown gasket retaining ring

[fixermole]

While I wait on a new crown gasket, I noticed after cleaning that the retaining ring just sits inside the crown loosely. How are these typically held in place or are they held at all?

 

[oldhippy]

I think they could be machine pushed in. The ones I have come across have never shown any type of adhesive in holding them in place.

[rodabod]

Do you have a large enough diners punch to close the opening?

[fixermole]

rodabod,

what exactly is a "diners punch"? That's a new tool to me; is it part of a staking set or maybe it's called something else in the US?

I was thinking of pinching the crown a little but hadn't seen a technique out there for such, especially to maintain even pressure throughout the circumference. It only needs to close maybe 0.1-0.2 mm or so.

[Tudor]

I don’t know must be a typo. 
 

But a hollow tapered punch would close all sides evenly but they usually aren’t large enough for a crown...

[HectorLooi]

I've tried chucking it in my lathe, then using a burnisher to roll the edge over. Just to be extra sure, I put a tiny drop of superglue. 

[fixermole]

Thanks everyone for the suggestions.

Since this is the second time I've come across this issue (in the last case the crown and stem were replaced), I think it's time for a homemade tool. I'll try the hollow tapered punch idea first.

[rodabod]

18 hours ago, fixermole said:

rodabod,

what exactly is a "diners punch"? That's a new tool to me; is it part of a staking set or maybe it's called something else in the US?

I was thinking of pinching the crown a little but hadn't seen a technique out there for such, especially to maintain even pressure throughout the circumference. It only needs to close maybe 0.1-0.2 mm or so.

Sorry, autocorrect on my phone - diners =  diameter!

And I guess you’ll want to pop a 2.5mm gasket in there (or whatever the pendant tube size is).