@marcel Actually, it looks like that is the only one they do, a flat one. It does mean that the neck will be raised though, so it’s like lowering the bridge. This would give more adjustment but the nut may have to be altered too. 

Posted by: @boo

G&W are selling shims now too. 

@boo thanks, I’ll have a go at making some first but at least those are a sensibly priced option

Posted by: @tej

thanks, I’ll have a go at making some first but at least those are a sensibly priced option

@tej No probs. When I spotted these, I thought of you. Knowledge is power. 👍

Posted by: @marcel

I have used a shim to adjust the neck angle a couple of times. I just put in a small strip of veneer in the back of the neck pocket. It's a matter of trying what the thickness of the veneer must be to get the desired neck angle. Always worked for me.

I’ve done similar to Marcel.

For the shim material, I’ve used old business cards - which are thicker than the 0.6mm veneers - when I’ve needed a large angle, or a couple of pieces of veneer stacked on top of each other.

Cut one veneer to - say - 2/3rds of the length of the pocket, and the second one to half that length.  
I’ve not encountered a problem with the screw holes then being slightly out of alignment.