[Yosemite Sam]

I believe in one of the manuals somewhere it says, to add spacers between the top of the deck and the brackets that pin to the lift frame.

I have several decks that have various type of spacers/shims to lower the rear of the deck.

It would be a lot of work but, I believe that it would be best to replace all of the worn parts that keep the front of the deck up.

The rock shaft and the forked bracket ("front pivot link support") often times, wear badly.