Re: My CUSTOM Internal Bassdrum Mic Holder System [Promo Video]
David, some kind of flexible/gimbaled arm might work. If you had the straight arm going down to the plate in two sections, with a small hinge and then the baseplate on a separate pair of threads so the angle can be adjusted, you could quite easily alter the height and angle of a PZM like the Beta 91.
Just a thought. Engineering-wise it's simple but it might add to the cost quite significantly.