Only use two headstops on the sheet. Pull them back about halfway. Use minimum push on the side guide and make sure leading edge of sheet isn't...
Check your roller stripes against the ocillators and the plate. Also make sure dampners are even and run as dry as possible.
I agree with with turbotom1052. You can buy from heidelberg or most print suppliers carry it. All you need is the thickness and size.
Switch air cylinders from another unit or side. If the problem goes with it then you know it's the cylinder. If problem remains clean it.
Sounds like your timing is off. Jog sheet onto board and advance it as you watch. sheet should be released a couple of mm before head stops and...
