BEFORE THE END IS COMPLETE
Touch nothing!
You must not do anything which would affect the running of a wood (your opponent’s or yours).
Do not stop woods from going into the gutter. This is considered impeding a running wood and you will forfeit all your bowls for that end.
Wait until the end is complete before picking up the jack or any wood. You will forfeit all your bowls.
AFTER THE END IS COMPLETE
You can pick up your own non-counting wood/s.
You cannot pick up or move the jack or any wood which may count until the end has been decided (ie the points have been awarded). If you do so, you will forfeit all your woods.
You may pick up and move woods with the consent of your opponent.
If woods from another completed end are in your way, you must gain the consent of the player before moving them.
THE EXCEPTION
You may stop a jack or wood from another game if it looks like it is heading into another end.
References From The Laws Of The Game
6.2 If a running jack or bowl appears to be in danger of striking a still bowl or jack belonging to another end, such running jack or bowl should be stopped and returned to be replayed.
6.3 If a running bowl is impeded in any way, except by either player, it must be played again. If a running bowl is impeded by either player, all the offender(s) bowls shall be forfeited at that end.
6.4 A player must not attempt to affect the running of any bowl, nor follow it up in such a manner as to obstruct the view of the opponent.
For a first offence, involving the player’s own bowl, that bowl shall be forfeited. In the case of a further offence, the game shall be awarded to the opponent(s). The offender(s) to receive no further score and the opponent(s) to receive the maximum score.
6.5 Should a player attempt to influence the running of an opponent’s bowl, all the offender(s) bowls shall be forfeited at that end.
7.5 a When an end is concluded neither the jack nor a bowl claimed to count may be moved without the consent of the opponent until the points are counted and all players are satisfied, otherwise all bowls of the offender(s) shall be forfeited at the end concerned.
7.5 b When an end is concluded i.e., all the bowls have come to rest, a player may remove their own non-counting bowl without incurring a penalty.
7.6 Should any player of an end touch or displace a still jack or bowl before the end is complete, all the bowls of the offender(s) shall be forfeited at the end concerned.