One thing to try as far as repairing the call you have, put the call in the microwave and then use something you can push through one of the sound holes on the back to try to push the glass out. A lot of those glues that break down and fail like what’s happening on your call will soften in the microwave to where you can push the soundboard and calling surface out.
As far as a new call, lots of great builders but I sure have loved toting a few new Buster Halfords I got this season. I like Buster, Clay Townsend, Jack Mincey, Jimmy Schaeffer, Lon Trice, Stumpy. As far as slates specifically, Buster and Mincey, but I love Cane Creek’s slates as well.
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