How do I unlock a pinned cell again?

More in Sticky cells & pins

• How do I lock a single cell to a symbol so it survives spins?
• How do I pin a cell for only N spins (a TTL)?
• How do I store a value/payload on a pinned cell?
• How do I read all currently pinned cells?
• How do I move a pin from one cell to another with animation?
• How do I keep a pin in place when the board reshapes (MultiWays)?
• How do I make a pin migrate back to its origin row when there is room?
• How do I override the spin result so pinned cells always win out?