Could hand technique be contributing to square thrus taking more than
two beats per exchange?  One of my long-past English dance instructors
taught pull-by hands as almost a quick handshake-and-release, where
you're no longer in contact by the time you're shoulder-to-shoulder.  If
the dancers maintain contact for longer than that, one of them is almost
certainly going to have less than a 1/4 turn after the exchange, while
the other will have more than a 1/4 turn.  I've observed this phenomena
even in 16-beat square thrus with balances preceding the first and third
exchanges.

--Nick 

[Stuff below Rich's response snipped]

On 09/08/2018 09:34 PM, Rich Sbardella via Callers wrote:
> The Callerlab timing chart has square thru taking 10 beats from a
> static square and 8 beats from (closer( facing couples such as they
> would be after the heads star thru. 
>
> In the following square I would allow 10 beats.
>
> Heads Lead Right & Circle to a Line,
> Lines F&B
> 2 ladies Chain Across and Back
> Has Square Thru 4  (This square thru is from a line of four that is at
> the sides static position.
> Corner Swg & Promenade
>
> In the square, below, I would use 8 beats for the second square thru.
>
> Heads Sq Thru 4 (10)
> RH Star (8), LH Star (8)
> Corner DSD (6), Sq Thru 4 (8)
> Can Swg (8), Promenade (16)
>
> In this square the dancers start the second square thru nose to nose
> rather than across the set.
>
> Most contra would be starting a square thru from across the set, so 10
> is a good number, if it starts after a balance, 8 would be wiser.
>
> Rich
>

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