Big Rock Measurments for the hole to cut in the chassis with a dremal for spur gear?

[Alex Strobel]

What does everyone think about the mod where you cut out a strip of your chassis for your spur gear so rocks come out. Sound like a good mod.?
If so can I het the measurements?

 

[Overpowerrc]

Use a Dremel and get the biggest rock you found in there and make that rock fit through the hole

 

[Surchaufeur]

What does everyone think about the mod where you cut out a strip of your chassis for your spur gear so rocks come out. Sound like a good mod.?
If so can I het the measurements?

I did it with my blung eyes with a drill bit i i wa susing like a 10mm drill bit i think and i just made the lenght the size of 20mm