SW200 PDS Spider Vanes - central or offset?

[Notty]

Hi, I can't find this information anywhere, should they be exactly central or do they need an offset, if so can anyone tell me how much?  I took mine apart and put it back together again to collimate but they are noticeably off centre and I can't remember if it was me or if they came like it.  Can any fellow owners advise please?  I am sure I read there is a mirror offset but I don't know if this offset is built into the mirror holder.

Many thanks

[Moonshane]

they should be central across both opposite vanes. i.e. your tube can be oval but make sure that the two vanes across from each other are the same length

the secondary offset you refer to is set at the factory when the secondary mirror is glued to the stalk.

[Notty]

Perfect, thanks for that.