I don't think I wiped to many AF117's but I think it was the AC126 that caused me most grief. I took the most most excellent manual at face value and "tried a few things" of my own. My pocket money was 2/6 so if one of the fuses went I had to collect bottles on Carbis Bay beach (in the summer) Corona bottles had a deposit think it was 3d so 20 bottles equaled an AC126 + a few extra bits thrown in to keep me keen!