David Hobby. One of the things that David is constantly promoting is his preference for using 1/8" (3.5mm) miniphone audio cords instead of the older, standard PC-sync cords for syncing flashes. PC jacks are notoriously unreliable as well as ludicrously expensive. Miniphone jacks are both more reliable and dirt cheap. Even better, the Cactus V4 radio triggers that I use come with 1/8" sync ports built in. Unfortunately, none of my flashes came with them. My old Sunpak Auto 544 "potato masher" flash came with a proprietary jack, but when that jack started to flake out on me, I figured it was time to add a miniphone plug to it.