So I was all set to buy one........................

[Smurfy]

....................and then I found that they only come in 1/8", and so won't fit my 3/16" sprocket and 3/16" chainring properly.

 

[Theseus]

I've got some old tins of paint you could use

 

[TheDoctor]

It'll work fine.
Looks 'orrible, mind

 

[Landslide]

....................and then I found that they only come in 1/8", and so will fit my 3/32" sprocket and 3/32" chainring, albeit not quite as snugly as Sheldon intended...

There ya go...

 

[biggs682]

lifes a bitch