I did some searching and found some info, but nothing difinitive. is there a real advantage to having a top plate milled as opposed to running a reversed shim on top of your D60 passanger side spring? What are some pro/cons I should contemplate? Also if you like the shim, would you use an alum shim? Bolt it to leafs or not with center pin? or steel? or steel welded to bottom side of ubolt plate? I know I need something to even out the loads on the studs, just not sure which idea is better. I can afford the milling, so not looking for cheap way out, just thinking removing any material from the top plate sounds like it is asking for it.