My model 14SB John Deer mowers " engage mower blade" lever is stuck and won't allow the lever to move. The small plastic tab/lever on the rear of the assembly has broke and rides against the safety lever on the handle bar. When you hold the safety bar it also catches this tab/lever on the assembly alowing the lever to move forward and engage the blade. Is there any way to make the lever work temporary until the new lever assembly arrives?