Re: how do you put (sd) covers on a (sd) pup?
It's not a problem, you just need to make sure that the hole spacing in the covers is the same as the pole sapcing of the pickups. I'm not sure if Seymour duplicates the Gibson and Fender spacings, there are at least three different Gibson pole spacings, the default being 50mm I believe and there is also a 48mm and a 52mm.
Providing that you specify the pickup you are ordering the cover for there shouldn't be any incompatibility, your dealer should be providing you with the right cover for that pickup.
You don't need to remove the screws normally, but it may help to screw them out about 3mm to give the cover something to register on.
You need to take the outer layer of fabric tape off and clean up the locating tabs on the baseplate. You need to get these very clean as you will be soldering to them. Only take the outermost layer of tape off as the coil terminals are soldered on to the black and white lead wires and these are covered by small lengths of tape which can become dislodged if you go to far or too heavy handed.
Push the cover on to the pickup until the screw heads emerge fully through the holes in the cover. The bottom edge of the cover should be flush with the baseplate or protrude about 1mm below it.
Scrub the gap between the baseplate and the inside of the cover along each of the long sides of the pickup with something like P120 grade abrasive paper.
You need a fairly powerful soldering iron for the next bit; I find anyhting less than 40w vrey hard work.
Apply heat and solder to the scrubbed joint until the solder wets the surface of the joint. This is tricky as all the thin metal plates act as heat sinks and dissipate the heat from the soldering iron quite quickly. Do this on both sides.
Job done.
You can wax them afterwards if you want to, but go easy as wax can get hot enough to soften acetate bobbins and i'm not sure whether the Pearly Gates are acetate or polycarb...