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This post from Don Moyer on 5.27.17 may be of help:
"Over the years, varnish in the oil will occasionally "glue" the valve keepers inside the retaining washer and be quite difficult to remove them in worst cases, but you should not have to use heat. All I've ever had to do is pry the retaining washer up using a really big screwdriver (or some other pry bar) using the bottom of the valve chamber opening as a fulcrum while tapping the valve down from on top with a medium sized mallet. Once the keepers come free of the retaining washer they will fall out. Don"
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