Can you put custom gears on a freewheel?

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I am sortof at loose ends at the moment. I have a spare seven speed freewheel I'm about to knock the locking ring loose on because, mostly for giggles, lets see if I can make a redneck single speed.

Now I'm thinking though. Can sprockets meant for cassets go on a freewheel spindle? See i like the 'megarange' in theory, but it's always BIG low gear and the rest of the gearing is straight up from the 14 - 28. Any way to shuffle that about so the gearing from absolute low end isn't as steep? Like... (example) instead of 14-16-18-20-22-24-28T, 14-16-18-22-24-28-34T?
 
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I don't think cassette cogs will fit the freewheel spindle. Cogs on my cassettes would not thread on to anything.
 

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Some cassettes can be took apart and rearranged some and there are spacers to convert sevens to sixes or fives but there's probably more investment than return unless you have a specific gearing in mind that you're trying to build. You can make a fun "redneck" single or even a 2 or 3 speed derailleur with a few spacers though. I may have to build me one...

Carl.
 
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If you have several thread on multi speed freewheels - same type, the cogs should swap. I've changed out the top gear on a shimano to make a super high.
You could grind the teeth off and make shims or buy shims. To make it a single speed and put the chainline where you want it.

More effective would be to use a single speed hub, with a regular freewheel and build the wheel with chainline where you want it by dishing the wheel
 
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