I need to grind extra hard grenetine pellets. Do you know what I need to use?
These pellets are like extra hard jello candy and I need to turn them into fine powder. I have already tried to do it using a coffee grinder, an industrial blender, a food processor, a corn crasher, but so far, nothing has worked. I would very much appreciate your help.
Answers below in Comments Section

You need an instrument like a nutcracker and a lot of strenght. Use a cheap metallic lemon squeezer and hit in the levers with a heavy hammer, put many pellets inside for cracking.
If the axis nail breaks, replace it with a hard steel screw or a bolt of the same diameter.
http://www.it.rit.edu/~jxs/classes/2005_Winter/409/GroupContent/Images/LemonSqueezer.png
You may need hard gloves and glasses.
The lemon squeezer are made in drop forged steel, the impacts can break the instrument. Cover it in rags to prevent smashs and fractures.
Exists a tumbler machine with a rotatory drum to sand stones. The cylinder rotates several days, is used to round up pieces of quartz and agate, You’ll get a kind of mud to filter in paper.
It is sold in shops for jewelers and artisans, is somewhat expensive.
http://www.kaleidoscopeiow.co.uk/metalpolishers.htm