Trevor Duffy's Coin Dropper LEFT HANDED (Whole Dollar) by Trevor Duffy Bitten Two of the routines deal

Two of the routines deal with knots appearing and vanishing from ropes

Nicola Lazzarini aka Zazza is a professional magician who uses the puzzle in his magic shows

Going further than that

You only have four cards

Trevor Duffy's Coin Dropper LEFT HANDED (Whole Dollar) by Trevor Duffy Bitten Two of the routines dealTrevor Duffy's Coin Dropper is a precision made utility device for immediate and inconspicuous delivery of 5 coins to the hand. See these important points: 1. Manufactured in stainless steel. 2. Black powder coated for concealment. 3. One dollar and half dollar sizes. 4. Left and right handed versions. 5. Can take slightly smaller coins with an easy self made modification. 6. Each version holds 5 coins. In addition, the dollar size can accommodate 10