Originally Posted by
onespeedbiker
Found out what you were talking about. It's interesting, but with the probability of scratching the paint and/or denting the BB shell, I think I stick with a chain whip or x201's Ratchetfix..

(or maybe not the Ratchetfix either)

Or try putting the chain around the BB spindle rather than the shell, which is what I did last time I was faced with installing a track sprocket. Alternatively, use a rag to avoid scratching the paint, and if you have a bottom bracket installed, I'd say that denting the BB shell is very unlikely.
That said, a chain whip is a perfectly adequate way of fitting track sprockets, I only rotafixed that one because I was at the co-op rather than at home, and we only have a 3/32" chainwhip at the co-op.