Same here. Replaced the worn balls with ones of larger diameter on several
gliders. Easy fix, works very well. Parts available through TC-holder.

At 01:29 26 August 2013, wrote:
I believe the approved fix for this is to install ball, of a larger
diamite=
r.
I'll check on that. They are available.=20

The idea of installing thin shims does not work on Grobs. The attachment
is=
quite different than other gliders.

Roberet Mudd
Composite Aircraft Repair
Parts and service for Grob gliders and motorgliders=20
Moriarty NM=20



On Sunday, August 25, 2013 7:54:04 AM UTC-6, Astir. wrote:
The rotating collars are locking the wings correctly, the FM states
there=
needs to be a 5mm gap shown on the locking collar, which is now
approachin=
g The paperwork I had as far as I recall was from Grob to the UK air
cadets=
who flew a fleet of Grob gliders, which stated that a thin shim could be
p=
laced onto the wing spigots to take up wear. In "little balls" At 12:41
25
=
August 2013, JJ Sinclair wrote: On Sunday, August 25, 2013 3:57:26 AM
UTC-=
7, Astir. wrote: Has anyone got any definitive documentation regarding
t=
he fitting of "thin" shims on Astir wing spigots that are
approachin=
g the 5mm limit on collars I recall having something a few years
ago,=
but unable to retrieve it Fully aware of the engineering logic of
to=
o thick shims and ball/spigot relationship Are you saying that
the=
'little balls' inside your locked lift fittings, have reached the
bottom
=
of the spigot 'groove' and the wings are not tightly secured to the
fusela=
ge and you are considering rectifying this condition using shims?