Quote: bren2k "Does 'lending weight' really need to be explicitly described in tiny detail though? We're not playing tig, so it seems safe to assume that the act of lending weight would require some weight to be leant. Doesn't it?'"
Apparently not...
Quote: bren2k "Moving tackled player 2. (a) Where opponents do not make a tackle effective in the quickest possible manner but attempt to push, pull or carry the player in possession, it is permissible for colleagues of the tackled player to lend their weight in order to avoid losing ground. Immediately this happens the referee should call “Held”.'"
The key word here is "immediately". There is no requirement for movement to be halted or some random subjective assessment by the official about how much weight is being lent - the instant a second player from the attacking team joins the tackle he should call "held".