Had shot the Superposed at the club as usual (ie using both triggers, didn't think about it) but after the last target, taken cleanly, called for another and tried the double single and what! no bang from the front trigger. Went to the pattern board and the second trigger did as it should. What to do? As I use both triggers not really a problem but... Decided to take things apart and make sure both sides were the same (nothing out of order etc). All was good so cleaned everything with gusto and spirits and after reassembly what a difference a clean makes. (With apologies to whoever wrote the song I just paraphrased).