I will have to move the secondary mirror down by 5.5 + 9.4 mm = 15 mm
towards the primary mirror.
The spider was installed at the wrong rotation.
Mike Sidonio's Newt. has the spider offset by 45 degrees to the focuser:
https://pbase.com/strongmanmike2002/...th_the_catseye
It's obvious now that it's a better spot for the spider as it's not
placing direct strain on the focuser which could cause tilt.
Why didn't TS in Germany think of that too?
Gee wizz - moving the focuser tube up 15 mm could be a problem.
To move the primary mirror down 15 mm would mean having to make new
extension spacers for the mirror cell.
I have only just added anti-lateral movement springs which work
very well to stabilise the mirror cell.
The gap left over would be wide enough for those wooden blocks
as they could be placed partially over the metal ring.
This is starting to get very complicated.
see pictures.
cheers
Allan