In at least one example, the base has polygonal guide holes through which {HEAD ~ the stems} extend from the base in {TAIL ~ the extended positions} 
In at least one example , the base has polygonal guide holes through which { HEAD ~ the stems } extend from the base in { TAIL ~ the extended positions }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL