Yes it can be a frastrating job sometimes setting neutral , there were two styles of pintle arms and the adjustment techniques vary from one to the other , I am just going to state the way I do the older style which came back around after a layoff and is the current syle now , first thing is check for looseness in the pintle arm to shaft connections , if neutral is really off I start by loosening the two 9/16 hex headed bolts on top the pintle plate on the right looking in the machine from the front , this side needs to be set first or it wil be harder , by loosing both you let the pintle slide over and equall out , I "ll guess at center and tighten up , I 'll start the machine and see which side pulls what way , then loosen the bolt on top the pintle enough to use a hammer to tap on the head of the bolt the way I need to go to compensate for the pull , note that every action has an opposite reaction and the other side usually needs to be adjusted after moving the opposite side , if it is jacked off the ground it is easier , I can usually get it right in three tries ----------I have had a couple of beers after cutting grass all morning in 90+ F temps so my explaination maybe a little dizzy