I have a newer model b2650 with a 72" mmm. I recently took the mower deck off to use the brush hog and noticed that the linkage arms, used to raise and lower the deck, still move with the 3 point hitch. I understand that the b2650 does not have the mower height adjustment knob as the deck is "ground contact." I could not see any easy way to pin up the linkage arms and do not have the mower manual. Does anyone know how best to accomplish? I understand it would be the same for other 50 series compacts. Thanks in advance!