You can buy shim kits for them. I have them on 3 swfas and they work fine. They usually don't align perfectly but usually not more than .3 mils past 0.
I've never taped the windage dial on my 3-9 hds and I've been dragging them around for 3 years now and they've never moved.
Garden hose gasket or sight glass rubbers for a treater work too