Marbles can be added to existing equipment within your equipment inventory menu or when building new ones in Building Shops. This lesson explains how to insert them into existing equips.
Here is how to assign a marble to an existing equip:
Please note that if a marble already exists in this slot that the old one will be lost forever after successfully placing a new one within it.
You can improve your chance of successfully inserting a marble into an already built equip with the Player Growth Attribute Smith and the Credit Shop Key Item Golden Anvil .