JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. Stretching Rebar To stretch rebar: Select the Stretch Rebar tool . On your model, click to identify the bar that you want to stretch. Click to define a base point for the bar extension. Either: Click to define a second (distance) point. orType a positive value to lengthen the bar or a negative value to shorten the bar. Parent topic: Modifying Existing Reinforcement