An alternative way to remove the crank is to leave the fixing bolt off and go out and ride the bike around a nearby hilly loop until the crank comes off under
pedaling torque. Not the best way but cheaper than a gear puller. Gear pullers need a square surface to pull against which many sq taper cranks don't have
but yours does. Can't disagree with corrado on using the puller as a chaser, but consider that a thread chaser has sharp hard cutting edges and unless started
properly will just cut a new set of threads over the old ones. The puller is dull enough that frictional forces will tell you something is wrong. A very careful
approach is needed either way.