replacing 250px primary screws

[sunshine185]

I am looking to replace my collimation screws on my 250px for some longer ones, anyone point me in the right direction? I don't even know what size thread they are and if I did manage to find some, do I have to smooth the ends so they don't damage the mirror? I also presume I would have to find some bigger, stronger springs too. Any help our advice would be greatly appreciated.

[Spec-Chum]

2 words, bobs knobs. They do springs too http://www.bobsknobs.com

I love them on my 200p

[moriniboy]

I use stainless steel metric socket allen heads, collimate with ota horizontal just in case you drop the allen key

http://www.westfieldfasteners.co.uk/ScrewBolt_M.html

[cotterless45]

If you replace the 2ndry ones, make sure that you get enough length, knurled are much easier. If you can replace the primary springs with Bob's , you'll find the scope much easier to collimate and hold collimation, neat,

Nick.

[Avo]

I'l second Bob and his knobs.

piece of cake to order, the guy is efficient, quick and had no bother with customs as is only low value.