I looked inside the water tank and discovered the little rubber flapper valve was deteriorated and wanted replacing. So I went to the shop and discovered the replacement part came with a new chain. At first I thought it was a metal chain painted black, but when I pulled out the old one I discovered it was plastic. Our water is slightly chlorinated, and I suppose this over time caused the plastic to go a reddish grey colour.
Anyway, I tried a bit of the old chain on my train and it looks and works very well.
The plastic is strong, but snips easily with wire cutters. It looks better than the brass wire ones I made.
Gentlemen, if your W.C. leaks, fix it and use that chain.

