I used a cog kit but if you have spare cogs lying around definitely just use those.
If I remember correctly I had to file down the circle clip just a smidge to refit it with the new cogs, otherwise it was fairly painless.
Cool. Was thinking about cog spacing concerns, I've got a feeling the stock ones wouldn't fit, or that the spacing on some of the cassette sprockets I have might not be ideal. I'll experiment.
I used a cog kit but if you have spare cogs lying around definitely just use those.
If I remember correctly I had to file down the circle clip just a smidge to refit it with the new cogs, otherwise it was fairly painless.