I have used George's shims for 2 years in cut comb production and it has
been the  easiest most productive thing I have done to encourage my bees
to draw and fill comb as complete as any beekeeper could hope.
It just makes sense to let the bees do their thing without having to go
through the entire hive.
In winter they are my top entrance and ANYONE can make their own!
Thanks George!
Michael (West Branch Apiaries) Mid Michigan