How to attach tugs?

surly chaintug, havent got one on mine but they apparently do the job on forward facing (bottle opener as well!), you are using track nuts aren't you? just give them a good tighten if anything

Got this in the post this morning; works great I'd recommend a chain tug.

However, the surly one is alot bigger then most other tugs (due to the largely unnecessary beer openers) & isn't the prettiest.