How do I remove...
 

Bought an 86 Cabriolet last week, and have now decided to replace the rear plastic window, since it's got a small crack in it (besides from being nicotine-yellow in colour..).

We have a shop in town that's got national reputation for being experts at cabriolet tops, but to avoid having to pay "Porsche-prices", my thought was to simply remove the rear portion of the top (from zipper and backwards) and bring it to the shop, so they can replace the window.

Besides from unzipping the zipper ( :cool: ), how do I get the rear portion off (I haven't looked that closely at it yet; thought it best to ask someone who's done it first :) )