Hey guys!
this is a small tutorial about how to keep replacing an item in someone's slot.

This is very simple and requires only one command.

/replaceitem entity @p minecraft:diamond_sword slot.[press tab until u get slot.hotbar... something like that]

Set the command block to repeat and always active.

Sorry , i am not able to devote enough time to my maps and builds. Ive got many things to finish in this month, my projects !

For more reference, you can take a tutorial on youtube. :)