Years ago, me and my mate was on the 550Four on the way to the pub when the chain snapped coming off the A470. I had a look at the chain but it was buggered. I pushed the bike to the pub and left it there for the night.
The next day, I asked one of the fitters at work for 102 links of 583 chain. None in stock. Bugger.
I was looking through some scrap machinery, undid a cover and found the correct chain. I counted the links; exactly 102. 5 minutes later, it was in my pocket.
I removed the cover on the other side, another 102 links !!