going buy your past replys i think u should have a look in the mirror and why not try talking to your techs to sort out ways round the problem or is your place of work the type of environment were techs feel that they cant be open to freely speak there mind?.You should be having monthly meetings were everyone can freely speek there mind about anything and then do something about it.
But duodeluxe if you need to come onto a foum to get advice on how to deal with staff or how workshops are run then what does that say about your leadership skills or your company for training you for that particular job