Step 15: Prongs
Fold away prongs are a interesting feature for transformers. These prevent abrasion or damage to other objects their stored and transported with. Similarly a cover preserves the metal and makes it easier to transport.
The first prong guard is a simple piece of plastic that is sometimes included with the retail package like the twisty ties.
It is also possible to make a cover using plasti-dip, scotch tape and a releasing agent such as vasoline.