At 07:23 07 March 2016, Steve Thompson wrote:

Suggest instead of opinion - just use the MM for the glider.

A very good suggestion. Did a Twin Astir wing frequency check the other
week, and that was off by 5 compared to the last measurements. Turns out it
somewhat unusually should sit on its wheel and skid (12th item of the
annual checklist in the mainenance manual) not on threstles, with a
specified tyre pressure of 2.5-2.8 bar. Remeasured and it now was bang on.
The way you measure DOES matter.