For fine soldering work the fine point tip is required. For larger power connectors you need a bigger tip to transfer the heat asap into the solder work.
If you are young, make sure your soldering iron has a fan to draw away the fumes...... if your are old like me and/or your amalgam dental work contains lead....... too late!
Avoid the cheaper prop balancers that are magnetic.... the steel shaft can become magnetized and cause your prop to rotate to a specific position. If you try to demagnetize it by striking it, you will likely bend the shaft and that is even worse. The Dubro with bearings is a very good choice from my perspective.
this message sent from my Etch-A-Sketch using both knobs!!!!! :shame: