Materials needed:
Cheap stainless seive (3 quid from amazon)
Jubilee clip (pence?)
Long nose pliers (already owned)
Grappling monkey strength (already owned)
Method:
Use pliers in combination with monkey strength to destroy seive:
The horribly scratched kitchen floor is not critical to this process, but feel free to replicate it if you wish.
You now have a useless metal ring and a dish-shaped piece of stainless mesh. Turn your attention to the mesh and flat it out.. it started life as a flat sheet and its very easy to return it to that state.
Fold the mesh in half and use your pliers to roll the edge and crimp it like a Cornish pasty.. remember to leave a bit uncrimped for your collection pipe.
Secure your pasty to the pipe in your boiler with a jubilee clip.
3 quid hop stopper: Done.
Now.. if there's some kind of prize for the worst DIY skills ever exhibited on this forum, I demand it.
