Soldering mesh filter back onto a drain plug

When my connecting rod let go, among the small bits of damage it did was to separate the wire mesh filter from the drain plug of my sump.

So how do I solder them back together?

What's the correct material? Is 4% silver, 96% tin sufficient?

What about flux? Full on, paint/daub on acid flux, or acid core, or just rosin?

Technique? I'm thinking that this can be done with a propane torch. Tin the plug, tin the mesh, bring them together and re-melt the solder?

Any advice is greatly appreciated.