I have an old bike 5 speed 1980's steel it uses a screwed on cassette not shimano type of thing but it has threads. IS there a conversion kit for that type of hub? The issue is the spacing of the drop outs is narrow 120?? so I need to use the old school hub. So what can I do to just go to 1 cog?
Or am I f'ed"

Just get a cog of your choosing and spacers. Hopefully, you've got horizontal drops.

unscrew the cassette(multi speed freewheel i mean, i screw them up all the time), screw on a single speed freewheel, adjust spacers/redish your wheel

That's not how those older cassettes work.

I'm pretty sure he's talking about a cassette that uses the smallest cog as a lockring - which are a pain in the ass.

OK boys here it is......so now that youoknow whatthe issue is is there a solution?
I have a freewheel
https://sheldonbrown.com/free-k7.html

Now that it's cleared up, see nuhtowel's post but change the word cassette to freewheel.

+1

You'll want to thread a single-speed freewheel on there, and redish the wheel as necessary to get your chainline straight.

I'm not a grammar Nazi, but it really does help to write in a way that other people can understand...

I edited my post, I mix those up all the time haha

Shimano -briefly- made a 6 speed freehub body that screwed onto a freewheel hub.

99% of freewheels on bikes sold in America are ISO thread. Any single speed freewheel with 16t or more will fit. More than likely if the current hub isn't Shimano, it's Suntour: There should be 2 or 4 slots around the axle. That's where the removal tool fits.

Once again, the bike is old school Italian with Galli hubs so I am wondering if the threads as different from what most bike store will carry....and what size is a 5 speed 30 yr old chain?\

I didn't think of that. If it's Italian threaded you may be up a bit of a creek.

Any 3/32" chain will most likely be fine.

There is slightly more threading on an Italian rear hub, but it's the same threads per inch as ISO, so you can still screw on a regular single speed freewheel.

Any chain listed for anything from five to eight speeds will work. KMC makes a nice non-index 5 speed chain that's insanely cheap. You'll need to make sure the freewheel has 3/32" teeth.

Depending on which gear you want to use, you might wish to start off by shortening the existing chain to fit the appropriate rear sprocket, after removing the derailleur. This will help you get the feel of what gear ratio you want to use. If you go to a single-speed freewheel, it will most likely require a new 1/8" chain.

any ideas where I can buy the single speed freewheel & spacers??

Thanks guys

Just about any bike shop will have SS freewheels. Shops that specialize in BMX will have the widest selection. Some shops may have spacers, or you can order them online. That said, the chainline should be almost perfect without them.

Forgot about 1/8": If you get a 1/8" freewheel, you'll need a 1/8" (single speed) chain. This will work fine with your 3/32" chainrings.