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Sorry if I've caused you to be confused.
Let's start again.
Why do you want to remove the block from the hub?
If it's just for cleaning purposes, I'd leave where it is and clean round it.
If it's knackered then it doesn't matter - use The Gren's method and throw away the remains.
It's unlikely that you'll get away with using the old chain so, if in doubt, try a new chain on that block - if none of the sprockets jump, it's worth persevering with it.
What sprockets have you got? The most common five speed blocks are 14-16- 18- 20 & 22. If that's what you want it should be cheap and easy to find a replacement. Remember, once the block's screwed on the hub no one will know whether it's a Cyclo or a Shimano.
clubman
Urr, not clear at all what I should do now so will do nothing for a bit other than more research.
At least that way I’ll not break anything ha ha.