The insert provides the means for {TAIL ~ numerous adjustments}: forward and backward in the slot, cant or fin tilt angle by changing the insert, and {HEAD ~ different fin types} 
The insert provides the means for { TAIL ~ numerous adjustments } : forward and backward in the slot , ca nt or fin tilt angle by changing the insert , and { HEAD ~ different fin types }
OTH OTH OTH OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD