I have often seen in blitz games that when a player captures a piece and then hits the clock with the piece. Is that a legal move or is the player required to place it on the table and hit the clock with the hand?
Similarly, in the case of promotion, can a player hit the clock with the pawn after it is removed from the board after a promotion.
I also have seen players hold a piece in their hand during play, typically awaiting a promotion (with queen in hand) or just holding a piece?
Are there any official rules that govern hitting the clock with a piece or even holding a non playing piece during play?
Update: I know it is a bit late, but I the ultimate reason for asking relates to classic chess clocks where the buttons are somewhat small and stiff where pressing the buttons multiple times with your hand, especially in blitz games can get quite painful. More recent clocks have bigger and softer buttons so it is not really an issue if using one of those. This is where hitting the button with a piece is much easier on the hand. Does this have any affect on the final answer?