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As I’m going to rebuild the wheels,
'rebuilding wheels' normally means respoking - in that case you will certainly need to remove the freewheel.
The word 'block' (in this context) implies a freewheel with multiple sprockets.
If you just want to clean the hub bearings, you should be able to do that leaving that single freewheel (that's what they are called) in place.
It's worth pointing out that 48 x 16 gives an uncomfortably high gear for general use. In inches it would be three times the wheel size - 78" on 26's or 81" on 27's. and about half way in between for 700's.
P.S. Sorry! I've just looked back to your original post and I see you did call it a 'freewheel'. I was me who wrongly assumed it was a block because you mentioned it was a Cyclo. I do know that Cyclo made single freewheels and I've got one in my parts bin - I just thought mine was the only one left in the world!
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clubman
Edit.
I’m an idiot.
I’ve just looked again.
It’s just a single speed cog threaded on. I can just take that off.
No, I’m definitely the one confusing things here!
As I’m going to rebuild the wheels, I’d usually approach this by removing a block so as I can give everything a good clean. I kind of assumed that this - a single speed - block could be spun off the hub?
Then that can get cleaned up but I wasn’t planning on opening up the internals, which I think I might have mistakenly inferred. Far too much skill involved there which I don’t have.
The thing spins ok and doesn’t sound gritty and am hoping it might be good to keep.
Also, I do want to get the hub bearings out to clean up so to get the axle etc. out, again I assumed the block would need to come off first?
However I’d be much happier if all I need to do is leave it in place!
It’s a Cyclo Type B, 16t, front ring is a 48
The chain actually looks quite good so I’ll definitely give it a go when we get to that point.