I just removed all the valves from an Amazon head.
Place the head on a smooth surface ( wood is ideal) then place a small piece of wood under the valve, then using a socket over the spring hit the valve to break the seal on the collets, then use a proper valve tool to clamp the spring and remove the collets using a magnetic wand if they are tricky to flick out..
They are a bit tricky but it took me about 10 mins to remove them all..
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