02-21-2021, 03:23 PM
I've had a lot of mica wafers broken in the corner like that. It usually hangs out past the capacitor plate and is subject to being broken. I've never bothered about it as long as the mica is keeping the movable plate of the trimmer from touching the stationary piece. Will probably work just fine with the crack as well. May change the dielectric constant slightly but compensated for by the adjustment. I vote for using it as is.