Don't think that's right. One wouldn't, for example, be permitted to bowl thumbless if the label area was not in your palm as you'd, in effect, be outside of side/top weight tolerance.
Re the left/right hand delivery, the absence of a rule does not necessarily mean the activity is permitted.
Of course, if you're accurate enough like that it raises the question why not to take the advantage of extra power and revolutions and bowl with both hands for the first shot...
cant get anywhere near the head pin with a reactive. It's hard enough for me keeping on the right hand side of the lan 2 handed with my plastic spare ball. :bullrider:
Why the hell would a lefthander want to change hands in this country?
And I have seen shots where the right breaks down to unplayable, where it may well be advantagous to throw the first ball left handed and spare right handed. Not going to happen very often though.
George might come out and tell us he is really a better bowler right handed :surrender: