The difference between '21 and '28 barrels is so small it's irrelevent.
As for a cracked bridge? I'd run it if you can't feel anything sitting proud with your finger, then again I don't live in mortal terror of a seizure, it's just a mild inconvience. When it siezes don't blame me
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Please do not PM me technical questions, if you can't find it on the Forum start a thread