I think I used the big one on this set:
Clarke CHT270 3-Pce Gear Puller Set - Machine Mart
I just put the landy in gear and used a big adjustable spanner on the pulley dog-nut and ****ted it with a big hammer.
When you're removing / refitting the pulley there is a half moon tab that sits in a recess on the shaft. Make sure you've got the pulley at TDC before removing it or the tab will fall into the sump! When refitting I knocked a couple of burrs into the back of the tab so that it would sit still in the recess after losing the bugger a couple of times! why they couldn't have done this at the factory I don't know...