I just purchased a Husqvarna yth 18542 mower. The deck height is only 3 inches in the highest position (6). Looking under the machine, there appears to be two positions the pins could be placed in the rear which are labeled 1 and 2. The front has a single bar and while there is a second hole, it is not labeled. There is no reference to this in the manual. Is it possible to gain some additional deck height? I'd appreciate any feedback, thanks.