When I purchased the box of parts from which I renovated my 1935 MG PA it came with a tool! which was ideal for removing the two eared spinners which are exactly as those on my 4/4 Sport.
It is a piece of laminated wood about 1" thick, propeller shaped 20" long in the centre of which is a hole cut through the same shape and size of the spinner. This can be placed over the spinner and hand pressure is almost adequate to tighten or loosen, with the addition of a tap from a copper mallet. It can be reversed to use on the opposite side. No damage is done to the spinner.
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Jack
