In the other thread you will have read about inserting a hair into the hole of the roller. This would be an easy, non destructive way for a beginner to try affect a repair with a very fine synthetic paint brush thistle. The gluing idea is fiddly but can work "ok" , keep in mind how it might affect what holds the impulse pin in place if heat is required to make alterations to the roller's position afterwards. Maybe I was lucky, but a staking set I bought some years ago had 3 unused sizes of the dicussed stake. It doesn't close the hole, like a dome punch would ( trying that will crush the centre tube section ) but raises 3 notches inside the hole that which then grip the staff. Agreeing with Cees, that it feels somewhat destructive, but it did for me a few months ago. You could actually make your own very easily. Examine the tip of a 4" nail to see the 3  or 4 edges Now using something like a 3mm driver, remove the tip and form the 3 same sides, if you have a driver roller sharpener this will be easy. Now you have a stake to use on your roller by hand, take your time and be gentle !  If your stake is sharp you will be able to form the notches by pushing alone, roller will be soft.

Check out this thread: https://forum.replica-watch.info/threads/comprehensive-guide-to-clone-movements-found-in-rolex-reps.10936248/ There used to be a thread on RWI showing macro photos comparing every 3135 part in a gen vs. VS and VR factory clones but it looks like it is no longer available. This thread has some good photos. If you are going to buy a full watch and not just the movement on Ali, beware there are a lot of fake scam sites and it is easy to lose all of you money. Create an account first on RWI (they will go to bat for you if you have an issue with an order) and only order from one of the 'trusted' dealers listed on the forum. Only use the URL shown there as if you google the name of the dealer there are a lot of fake sites with an url off by a letter or number.

Can you elaborate? I'm really new to this. What Case and back are you reffering to?

You best option is t convert it to regular crown with tube sealing. But, the case and the back are totally  toasted, ready for the dust bin.

I don‘t think @VWatchie wants to buy a complete watch. The cloned 3135 movements are very affordable.