Making Grinders

[magicman34]

Is there a trick???

I never seem to get any C grinders above a +6, even on a lucky day. I've searched the shops and found people sellin +9 and +10 grinder for prices way out of my league and they seem to have loads to sell, i'm talkin 80+.

I tend to get mostly +1 and +2 no matters how long i wait to check or which day or char I make them on.

There must something I'm missing but haven't found a guide that gives you a clue on the actual makin of them.

Anybody have any clues???

Thanks