I’ll look these clips over now. I try to avoid making playing suggestions and tips, better left to Johnny. Coupla things I use….firstly, the ” pen “. Take a standard Biro, plastic and round if possible. Hold it between your lips ONLY, no teeth grips, no tooth contact period…lips only. Keep your head erect, place the Biro between your lips and make it stick out totally horizontal. Sounds easy I know, but you’d be surprised. Chances are it will fall immediately. Keep at it. Three seconds. Got that, try four five seconds, but no cheating. The pen has to be totally horizontal. Do it as often as possible, but don’t overdo it. Little by little, otherwise overkill will just cause burn and fatigue.