Do not hover over or fidget with the cards in the bidding box while considering your bid.
When an alert is required, the ALERT card should be taken from the box and making sure it is seen by both opponents, before being replaced in the box. The next opponent to bid can ask for the meaning of the bid.
If making a jump bid, first place the “Stop” card on the table to alert your next opponent that a jump bid is about to be made e.g a pre-emptive 3♥ bid.
Once you place your jump bid on the table, wait 10 seconds before returning the “Stop” card to the bidding box. This allows your opponent to bid “in tempo”, without undue hesitation that could convey information unfairly.
When your right hand opponent employs a stop card, wait for it to be removed before you make your next bid.
At the end of the auction, make sure the bidding is completed by having 3 passes on the table.
Leave the bidding cards on the table until the opening lead is made.
This allows declarer and both defenders to review and analyze the bidding. The opponent on lead has the opportunity to ask for clarification of the bidding e.g. the meaning of a bid etc. It also may help to prevent a lead out of turn.