On 21/10/2014 9:17 a.m., Don Schwartz wrote:
>> But to my mind an
>> existing or old wood screw and nut should be correct, so unless they are
>> coated with something jamming them up either the screw or the nut has
>> got moist.
>
> More likley both. I believe that as old wooden clamps shrink or expand,
> you can have a differential effect. The hole in the jaw only shrinks and
> expands significantly in one dimension ( across the jaw) , but the
> threaded rod shrinks and expands both ways radially. Plus, they are
> frequently made of different woods.

It occurs to me I could show everyone the sash cramps I made.

http://i141.photobucket.com/albums/r68/MisterSchmoo/02072013020_zpsa761
1268.jpg">http://i141.photobucket.com/albums/r68/MisterSchmoo/02072013020_zpsa76
11268.jpg

http://i141.photobucket.com/albums/r68/MisterSchmoo/02072013021_zpsba31
fbf9.jpg">http://i141.photobucket.com/albums/r68/MisterSchmoo/02072013021_zpsba3
1fbf9.jpg

http://i141.photobucket.com/albums/r68/MisterSchmoo/02072013019_zps0652
dcdc.jpg">http://i141.photobucket.com/albums/r68/MisterSchmoo/02072013019_zps065
2dcdc.jpg

They are made of European Beech.

Michael