Petey,
Why don't cha just put it on the back of 'spark's hat then have him look away. That way he can't rag on ya for missing the shot. He won't see it. My kind of spotter.
I put mine on the cheek piece. Trifocals ya know
Getting the 338 back from the brake installation this evening. Will be seeing if I can't make that thing shoot again.
Good luck.