The snowflake does not use a sealed bearing it is a "normal" tapered roller bearing and can be removed without any special tools. Just pull the grease seal and the bearing will fall out. Inspect the rollers and the race in the wheel carefully and if they are OK then clean, re-pack, and reassemble. The only time you would need any special tool would be if the bearing or race was bad and you would then need a puller (or punch) to get the race out after the wheel was heated.