LXD 75 Secondary mirror off center

[I.C.D (Ian)]

G'Day All,
My lxd 75 200 secondary mirror is a little off center ( It moved when i removed the end cap to collimate it) How can I get it back to were it should me and how hard is it and what tools do i need all help is welcome .
Ian C

[Merlin66 (Ken)]

Do you have a collimating eyepiece?
A cap with a small central hole ( 1.5 to 2mm) or a Cheshire type, will allow you to set-up and recollimate.

[I.C.D (Ian)]

Have made one today but what do I do with it .I have a laser collimator which I use to Keep both mirror's collimated .so how do I use the above to align the secondary mirror with the draw tube with the primary mirror. hope I have explain what I want .
Ian C

[Merlin66 (Ken)]

When you put the cap in the focuser, during normal daylight, you should see the outline of the secondary mirror in the circle of the focuser; this should be central and concentric. Adjust ( and or rotate) using the screws as necessary.
The secondary should then be adjusted to show the full primary mirror, concentric with the outline of the secondary.
Lastly the reflection of the secondary in the primary mirror should also be central and concentric with the other circles.
If you google on "Collimating a Newtonian", I'm sure you will find many references to help further.