Determine the finished elevation of concrete with a laser or string line and position a #4 or #5 rebar stake on the subgrade at the strikeoff point. Place the MegaScreed Driver over the rebar and strike with a Dead Blow Hammer until the height marker aligns with the laser or string line. Remove the Driver and place the high strength Yoke over the rebar. The Yoke will maintain the exact position indicated by the height marker. Repeat this procedure as necessary at each screed location. Then set a 1- 1/2”ID, 2” OD screed pipe on top of Yokes and you are ready to pour.