Just like the rudder counterbalance skin, the skin for each elevator counterbalance takes some coaxing to get into place. It's a tight fit with the counterweight in the way. There will be bolts installed to hold the counterweights in place, but the super tight fit almost makes them seem unnecessary. Alternating between clecoing each side as you work your way up the ribs is a good way to approach this task without too much headache.