Jesus, I wish I had one of those a last weekend.
I had to use a pry bar (that I wrapped with a rag many times, to be sure not to gnar the lobe) and a piece of Teflon between the side plate (to crush/ cushion) tha back side of the pry bar.
with some penetrating oil and no tapping with a hammer, the lobe simply slid off with adequate pressure applied to the pry bar.
I was surprised on how easy the lobe came off.
I did this on 3 20B blocks and there was no damage.
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