inserting a lead of a component into the plated through hole so as to position the component on {TAIL ~ the first side} of {HEAD ~ the circuit board}; and then 
inserting a lead of a component into the plated through hole so as to position the component on { TAIL ~ the first side } of { HEAD ~ the circuit board } ; and then
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH