Pull the handle towards the seat and you will hear a clicking sound as the lever moves. It will get hard to pull and when you let loose of the handle it will stay in place. Squeeze the little handle as you apply pull to the rear then hold the squeeze as you release the lever forward.
Looks just like the one I had on my 4100.
BTW, you got to give us time to answer. Not everyone hovers over the keyboard waiting on a new post. Patience is a virtue, or so they say.
