Have read the rules, was interested to know the interpretation of the rules.
TBA: alterations...not permitted during series or session of games
WTBA: permitted during the Official Practice and between the blocks of games
Vis: tournament, 2 game blocks, can adjust the surface of the ball during the break between blocks.
Therefore you can alter during the competition. You can adjust after starting bowling.
This was something noted at the weekend during Illawarra Junior Champioinships and there was some confusion and we did not have access to the web.
Thanks, leanne.