A coring device is mounted onto {HEAD ~ the platform} and used for forming {TAIL ~ a cavity} in the nuggets 
A coring device is mounted onto { HEAD ~ the platform } and used for forming { TAIL ~ a cavity } in the nuggets
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH