Just acquired a nice old model Bearcat. All original lockwork, no conversion kit installed. Serial number 16xxx. While removing the cylinder, the base pin was EXTREMELY hard to remove. Got it out and the head of base pin had evidence of "plier assistance". Polished basepin as needed to remove plier jaw marks. Base pin drops smoothly through the cylinder, no binding. Base pin goes through the front of the frame and goes into the rear of the frame and the pin latch retains it like it should. Try to install the cylinder and basepin together and I can only get the pin partway into the cylinder before it starts to bind up. Thanks for any and all help/suggestions with this "frustration". Longtime reader and first time posting.