You could try casting plain strips in place - that's how they used to do it 'back in the day'. I've done this a few times and it works well enough, but with no great improvement over popsicle sticks - which is my default.
I've also used comb offcuts, squashed along their tops, inserted into the top bar groove and held in place with a few drops of molten wax. Again - this works well enough, but not so much better that it justified the extra work.
Should not be much simpler than this:Hello, all,
I am going to try wax foundation strips this year and I was wondering what were different techniques people used to attach these to top bars?