Unsure how to remove wheel

[Dell]

I think this is probably mainly aimed at William because it’s regarding a Hermle Westminster but if anyone else can answer all replies will be much appreciated , I have a Hermle 341-021A with hammers on bottom on the bench and I have been watching the videos on the Hermle movements but there is an arbor and wheel that I can’t remove, it is the arbor with the four cams that determine the chime duration and it goes through backplate to the wheel that I can’t seem to remove, it has a thread and nut on the end so I thought by removing the nut it should come of , I tried to see if it unscrewed but it won’t shift, is it pressed on ?

when watching the videos the same wheel has two opposing screws but not on this movement see picture.

thanks in advance Dell

[Author]

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