Had this done on my NB last winter. They have to 'skin' the seat so to speak, removing the upholstery to get at the elements in it. I watched the tech struggle for a couple hours trying to get the upper upholstery back on to the seat, and it was rather entertaining( yeah, I get entertained by stuff like that at times... it's a sickness!) Here's the tip of the day for anyone slipping new upholstery onto a seat... pay attention, it will make life easier! :
Ever get a suit drycleaned?? You know the very thin poly bag it comes back in? Okay, take that "bag", slip it over the foam (think pillowcase) ... why you might ask?? The urathane foam in the seat has a very high friction coefficient.. tends to "grab" the upholstery rather nicely, making it a very good workout to get the cloth/leather back onto the seat. With the thin layer of polyethylene provided by the drycleaning baggie thing, you have an instant low friction surface between the foam and the upholstery. Less chance of reefing on the outer cover, ripping, stretching, etc. Once the upholstery is pulled down all the way, wrasseled into place, you can grab the plastic, and successfully pull/tear the majority out, or leave it in, it isn't going to hurt anything.
The way I discovered this is I am a Car Audio installer by trade, and we do quite a bit of vedeo (in the headrests). Sometimes, you have to strip the upholstery off the headrest in order to do some foam modification. Now, one day I was fighting with a GM headrest and it dawned on me... there was this very thin plastic bag over the foam... hmmm.... zipped home, grabbed a drycleaning bag, made a rough "bag" for the headrest, and voila! 10 min to get the cloth back on.... instant gratification! light dusting of silicone spray helps with leather, and dosen't cause any bleed through grief.
Just a little Helouise type hint for you all!
YMMV, HTH
Gus