Hi everyone.... I have heaps of "crusher dust" in a real nice dark grey color left over from a new house..its what was used when laying all the storm/water pipes in the ground etc..and its so close a color match to the real stuff!! problem being i have to filter handfulls at a time to get the required size etc..so ill be at it for years as i need tons of it... I have 2 qstns,,(1) has anybody had any bad effects from using it or heard of bad reasons not to use it ? (2) is there an easier way to grind/crush it all even smaller..? as there will be a lot left over that will always be to big for me to use,,Im doing HO and HOn3 so i would like a suitable size etc I am presently searching for a shop/company that may be able to do this so see what i find and im also looking into anyhting at all such as drill attachement,,rolling device,,hand grinder of some kind OR the wifes good electric blender!!! there must be something out there that will crush it even smaller?? Cheers,,,Jason.AUS.