mckeeranger
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I've seen 2 kinds of "original" arms. One has a long, straight metal leaf spring on a lobe, the other has coil springs like newer wiper arms.I just added napas version of the 25-11 on my stock arm and am somewhat less than impressed. i think it boils down to the stock arm not putting enough pressure on the blade. so i'll be ordering the anco arm and 13" wiper. for some reason my napa doesn't carry anco. so i'll find another source.
In my experience, the leaf spring doesn’t put much pressure on the blade. Our M35A2 has the coil springs and they seem to be OK. One of them was a little weak so I replaced the spring. That was a major pain to do, but it’s OK now.
Our M817 has the leaf springs, and they’re pretty weak. I may use the info from this thread and replace them when the paint work is done.