i found one on the net. 2.95 plus 8.00 shipping and handling. it came in the mail just before i left for hawaii and have who i got it from at home. i will check when i get back on the 10th and let you know where i got it and if it is worth a hoot. heard lots of mixed reviews so figured i would check one out myself
the half links they sell for a 415 suck. i ordered one and it was 1.99 plus $7.00 for shipping. they have a coter pin that hold them and i never used it. i am running a 411 chain now and real happy with it
I would NOT use half links. I bought one at a local bike shop (was 415 size) and the half link looked a slightly bigger than the rest of the chain. I did not initially give this any thought.. until I noticed it was getting caught on the motor (tight space) and ended up bending/ripping another master link.
I would just get a few master links to keep handy and use those.
the most reliable way to adjust and use your tension I have found and I have tried everything to the tune of two new rear wheels. Is to adjust for the motor chain then add the tensioner to the bicycle chain.