That was challenging.....
Heres how I did it.
It required 2 pairs of hands, long nose pliers, very small flat blade screwdriver and a hammer.
I cut the section out and mounted in a vice.
Squeeze down on the grip washer and insert screwdriver above spike then lightly tap with hammer until you can lever the spike over the ridge. While still keeping pressure on this spike so it doesn't drop back in the groove do the same to the opposite side and so on.
It was tricky and even another a third pair of hands could be handy.
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