Hello Stephen,

FYI - An AD for this issue was put out in Canada many years ago
(February 1991)!

looking at grob.aerospace.de I found this document:

http://www.grob-aerospace.net/filead...SB_Summary.pdf

And searching this document I found:

11.10.90
Überprüfung und Austausch der Holmstummelbolzen
Inspection and replacement of spar spigot assemblies
ASTIR CS, ASTIR CS 77, ASTIR JEANS, STANDARD II, CLUB II, CLUB III,
STANDARD III, CLUB IIIb
alle Werk-Nr. / all S/N

regards
Werner