Modifying Sky watcher 130mm

[Zendrix]

Hello all!

Because i can't reach to prime focus in my sky-watcher 130mm f:900mm using a Canon 1000D, im gonna modify it pushing my mirror forward a little bit. I'm following a thread in which they accomplished this successfully (http://stargazerslounge.com/showthread.php?t=47872&highlight=mod+130) but, althoug im confortable unmounting stuff, i don't want to commit major mistakes so, for anyone who might give wise advice, i would very much appreciate it.

Here is what i understood the process is about:

1- We replace the original colimation screws with longer (5mm araldite threaded rod, [5cm long?]) ones;

2- We use, instead of the original "O" ring, solid springs (1.2mm);

3- The araldite 5mm threaded rod (which i understood would have about 5cm (2"), would go inside these springs and the spring would be bearing the tension;

4- I suppose because these screws can't go forward and hit the back of the mirror, "geppetto" used this system of the wing nuts, so you will control colimation from there (which apparently makes it easier)

Doubts:

1- What king of caring do i have to have disassembling the mirror cells? What mistakes should i not do, besides breaking the primary mirror, of course? Is the mirror glued to the inside mirror cell?

2- Do the springs have to be really tight against the araldite 5mm or can they have a more comfortable radius, say like 6mm or 7mm?

3- How long should the springs be? I got some from a car shop, while looking for a box with thousands of them, and found 3 equal (2.5cm long and inside radius 5mm, maybe 1.2mm thick, so really solid ones)

4- Can i take the opportunity and try to clean the main mirror? what do you use for that?

5- Did someone here go through this process and maybe could share some pics and tips?

Thanks a lot in advance

Cheers

Rui