The search for a material that can be used when you need a really fine shim

Ive got a guitar I built . It's one of those that when you play it .its just sounds amazing but playing it action wise
it feels like a pig. I tried plastic shims, wooden shims ,card .Nothing seemed to work as it was just a smallish amount
And never liked that the above never gave me a tight joint. I just wanted my strings to touch the last fret with bridge in lowest position.
Then my good lady suggested that copper stuff on your bench ( clever bugger ) it is brilliant you can add layers it's easy to cut and shape If you need more near bridge end just put more at that point. Great for bolted necks . Not sure the glue would stick to it on a set neck,maybe it would. I just Love the way it compacts sits between the join and gives me such fine control . The other is because it's so thin you can put slightly more on the treble side to bring the neck into that just perfect height. So I have to say thankyou to The Mrs. One other thing if you guys have used it before , why did you keep it a secret lol. Hope it helps

Nice one Kimball :)

I usually use photocopy paper soaked with thin superglue, but I will give this a go next time.

great idea KB,
Pablo found out with his EX-1 build that shielding on a set neck does not bond well !
I'll give it a go next bolt on neck I need to shim

Shim sheeting?

Copper, steel, stainless etc

Usually in grades like 0.1, 0.55, 0.7, 1.0, 1.2 (etc) mm.

copper tape and sheeting fine for bolt on necks, and DB's idea would work for set necks I think.

Another for set necks would be to put a piece of timber in a vice and with a sharp plane, take a fine slice off the top edge. Use this fine planed off timber for your shim.