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Thanks Tony, this is what I suspected. I’ve ordered one off eBay so fingers crossed it’s a working one and it solves the problem. TC18 also shattered when I was attempting to tune the crystal (symptoms were already present) so I’ve ordered a used board to swap that out. Does anyone know of a good new replacement? I see plenty of ceramic Chinese trimmers but all of them seem to be two leg instead of 3. Or does that not matter???