Wacky - It is over..you made a decision and have a nice new tractor ..now put it behind you..that's what I would do..
I have a NH 29 D and the parking break from day one has been weak..these tractors weigh alot .. I'll tell you what I do...anytime I get off the tractor for a short time...I leave it running in idle & set the parking break ( for what that is worth ) and then the important part....I drop whatever attachment I have behind me and lower the FEL all the way + some so it is pushed into the ground...then I put the speed control in Neutal and gear shift in Neutral..and get off the tractor...Now that is what I do..
I sure hope you have trouble free enjoyment from your new tractor ..you deserve it after all you have been through...