Last week, the last day before a century, I broke my chain so I ran out and got the only chain my LBS had, a Dura Ace for my 10 speed Ultegra setup. I would have liked to change my cassette at the same time, but there wasn't one in stock. As some said, I'm getting some skipping cause the rear cassette is a bit worn. So anyhow I now have my hands on a new cassette - a 12-27 instead of my current 12-25.
So I have a new chain on my bike that was fitted for my 12-27, I suppose I'll new to add a link or two for my new 12-27. The Dura Ace chain that I put in came with 2 pins - the type you brake off when inserted properly. So my question is - should I pop out the pin I just installed a week ago and reuse it (along w/ a new pin) or should I pop out an original pin further away from the new pin and reuse it? Or should I try to see if the LBS has an extra pin and use that?