U want to add cooldown to ur items?
1place player action right click(or anything , after that u need to add cooldown )
2place If player holding item and ignore number(put ur items there which u want to add cooldown to)
3then place if player item has delay and put the item u want to add cooldown INSIDE(to add not right-click the sign with a regular arrow) NOT
4 then place player action set delay inside on left side put the item u want to add cooldown to and on right side put the number u want the item to have cooldown to in ticks 20 ticks=1 sec and in the same space add the function u want the item to have like give potion effects etc
Then skip a piston and place a else block between last two pistons and add cancel event there and also put a send message like wait for cooldown 
Ok ur done now
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