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I have some of the Hoffmans with the 21FP4. Luckily, all of my 21FP4s are usable. These are difficult to find. I did see a listing from Nebraska(I am in Texas) for one, but it is expensive and I am very afraid that it would be broken in shipping.
I have one Hoffman that uses a 19AP4(metal-glass). These are not just hard to find, but nearly IMPOSSIBLE to find in good condition.
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