We had no luck with a new rag top section or vinyl sheet so we effected a fairly tidy repair. Because the existing window was a bit fragile it was a delicate task but a sheet/section of ply or similar tucked and secured behind the flap gives you some stability and four drawing pins pushed through the corners, between the stitching really, stops the window section moving. I carefully removed the gaffer tape and glue residue, the latter with soapy water and a soft cloth, and the I carefully cleaned around all the cracks and splits and dried it all off. Clear T.Rex ‘ferociously strong tape’ cut into small strips helps to bind the longer splits, a bit like plaster stitches, and this is where the boarding comes in handy as you can push against it and using a wallpaper roller you can level everything out, especially when you put the longer lengths on. Just because I could I reinforced the top and sides before flipping the flap over onto the roof and putting the board underneath the window and securing it again. I cleaned it up the same way, a lot less moisture this time, dried it and went straight for longer lengths over the worst of it and it works. The vinyl window now looks more like a pen has been over it as the cracks haven’t disappeared but they are sealed and it is waterproof. One final bodge was using a staple gun with short staples in to secure a small section of the hem. Drive the staples in fully, gently pull the staples out of the boarding, still secured underneath, and hammer them flat sacrificing your thumb along the way. £10.99 versus £178. Quids in ……………..You just know something is now going to break