Forget About Adding or Subtracting a Yard for Now

Fairly often I see lawn bowlers practicing adding or subtracting a yard to their deliveries on a rink with cut up yellow tennis balls marking the intervals.  I’ve done it myself. My judgment: it’s a waste of time until you can consistently deliver four bowls the same length (within a yard).  This was so obvious once I thought about it. Delivering with exactly the same weight can be expected to be much, much easier than adding or subtracting weight, but who can consistently do it?  Certainly not me- yet.