I just got my Bakflip F1 for my 2012 shortbed. I installed it without the shims as they were not in the box. Everything went together smooth and it looks even without any tilt. I called Bakflip and they promptly sent out the shims.
Are the shims necessary? The instructions call for them up to the 2011's but this could be that the instructions were printed prior to 2012. What purpose do the shims serve? Is it added security for installation or to facilitate in the water drainage?
When the panels are folded all the way forward against the cab is it suppose to rest against the window? I put the adhesive on to cushion it when it contacts the cab/rear window. The panel closest to the cab (narrow piece) has two rubber adhesive pieces that are about 2" long that appear to cushion the folded panels. These strips are on the outside of each bolt that goes through the panel. In looking at pics of other Bakflips, I don't see these strips. Is this something new? I looked over the instructions several times and there is no mention of either aforementioned adhesive cushioning strips.
Overall, it is a nice cover and I am very happy with it.
Next mod is nerf bars