[HAM] Metric threads and heads

[Kon Zissis]

David Wells wrote:
>yeah my  '37 BC is the same, also the rear cover retaining bolt threads
are 
>metric if I recall.
>I reckon the TG magnet locking bolts are 4mm on the H100 and E100 tg's
I've 
>got or at least I didnt find a suitable imperial fit, and I looked.
 
Hi David and everyone.
The hex head screws on the TG pickups  of my 1962 C3 , my 1963 L-102 and
my late 60's or early 70's L-143  as well as my friend's 1959 C3  and
the other  B3 / C3 / A100 / RT3 organs that I have come across all have
4 mm hex head screws  and I use a 4 mm  spanner or hex  head tool when
recalibrating the TG pickups.
On the other hand  the hex head  screws on the TG pickups of  my 1972
XTP organ  and my friend's 1970 T-300  are 4.5 mm instead of 4 mm and
these 4.5 mm hex head screws  seem to be made of a softer or a weaker
kind of metal or aluminium  and the hex heads which are thinner ( than
the hex heads of the 4 mm screws of the other earlier era  organs ) can
break off easily when the screw is tightened. 
I had to replace a TG screw from the XTP and the T-300 with a normal
Phillips head screw   because the softer metal  hex heads broke off
these two screws when I was recalibrating the TG of the XTP and the
T-300.
All the best.
Kon