Preferably, the depth “DG” of the race is equal to or greater than {TAIL ~ the length} of {HEAD ~ the lip} of the largest cap to be opened 
Preferably , the depth “ DG ” of the race is equal to or greater than { TAIL ~ the length } of { HEAD ~ the lip } of the largest cap to be opened
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH