how to repair split cogs?

When repaired a cog in my last loco I used my old favourite epoxy resin, the problem I found was with the cog split, the gear was spinning on the shaft,


this resin filled the gap and glued the cog to the shaft, the problem with resin is it's really thick and hard to apply, it didn't close up the crack in the gear either, I think next time is be more inclined to use the G clamp and superglue method!