Green Frog
Member
You had Cogan do the plating for you. You owe it to yourself and to Cogan to at least ask them if they know what your problem is and what should be done about it. I seriously doubt this will be the first time they've heard about this problem.
I'm more familiar with Metaloy, and they advertise their plating makes fractions of a thousandth inch difference in dimensions, and that on any but the closest surfaces the change will not be noticeable. Cogan plated your cylinder, so you can assume the insides of the chambers were plated, so there may be some dimensional change, but if you go grinding, honing or otherwise polishing on them, you will be affecting the work they did, so once again, I would ask them before doing anything.
Froggie
PS I must have been typing while you were posting. I've got to learn to type faster!
I'd say you and Cogan have come to the best possible solution. 
I'm more familiar with Metaloy, and they advertise their plating makes fractions of a thousandth inch difference in dimensions, and that on any but the closest surfaces the change will not be noticeable. Cogan plated your cylinder, so you can assume the insides of the chambers were plated, so there may be some dimensional change, but if you go grinding, honing or otherwise polishing on them, you will be affecting the work they did, so once again, I would ask them before doing anything.
Froggie
PS I must have been typing while you were posting. I've got to learn to type faster!


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