I have one endorser currently: Curt Mangan Strings. I couldn't be happier with a company. Their strings are fantastic and Curt not only knows strings, but he answers the phone fairly often and loves talking about them. I got the endorsement because my drummer's old band was picked up by them and I just used that as an in. As a smaller company, he was really easy to work with and I've been rampantly promoting them since. I've done some work to get touring friend's bands on board, but hit these places up while you're touring. Ironically, I've gotten more people sold on these strings when I sell guitars with them on. I was talking with Vader cabs for a while and it was left off with hit him up when I'm touring more and looking to buy a new cab. That's really the biggest thing most of these smaller companies are looking for. Solid enough bands that are touring, easy to work with and really behind their products. The Vader deal not happening wasn't the end of the world though, I can't find anything as solid as my Marshall 1960BV - 300 watt version 4 x 12".