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I did have to clean the threads with a wire brush.
Here is another option for cleaning/protecting the threads...I found a large bolt at a hardware store with the same thread pattern as the delrin screws. I took the bolt and applied a small amount of grease to it and then inserted into the bottom of the gudgeon.
In screwing in the bolt, I found that this not only cleans up the threads, repairing any damage, burs or other blemishes, but it also makes working the delrin screws a breeze by leaving a small amount of grease on the threads.
Once a year I make sure that the threads are in good shape and I have never had problems since then.