is there a flat on the shaft?

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i love being married
it's great to find that one special person that you want to annoy for the rest of your life

Yup there is - I think that is what the grub screw goes onto, thinking about it.

When the screw becomes loose, the disk still spins - but goes "in and out" rather then stops spinning. I will definately have to take a few pics

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I went to a bookstore and asked the saleswoman, "Where's the self-help section?"
She said if she told me, it would defeat the purpose.

Hoovie

The stuff you need is made by Loctite and is called threadlock. It comes in different strengths depending on where the thread is being used and wether or not you would need to undo it again easily. I would imagine (but I may be wrong) that you need the low strength version which will prevent it vibrating loose but allow you to remove it without rounding off the Allen head of the screw.

Heres the stuff you need

http://www.henkelna.com/cps/rde/xchg/he ... E_HTML.htm