{HEAD ~ The intermediate balls} 37 and {TAIL ~ roll keys} 38 are provided in line with the housing wall 9 while the notches 45 are indented inside the housing wall 9 
{ HEAD ~ The intermediate balls } 37 and { TAIL ~ roll keys } 38 are provided in line with the housing wall 9 while the notches 45 are indented inside the housing wall 9
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH