I discovered a conversation to reduce the current center-to-center frame spacing from 1 3/8" to 1 1/4" in the brood chamber. Although narrow frames are not commercially available, the commercial medium sized Foundationless Frames caught my attention - I ordered the foundationless frames and assembled them using the glue on day1 and nail on day2 strategy.
I wanted to add a thin layer of beeswax to the center guide, but advice on the Internet seemed either messy or complicated. I filled an empty food can with beeswax - after removing the can from the boiling water bath, the wax remains liquid for many minutes - long enough for me to dab wax onto the center guide using a piece of cardboard. My application method needs more work - imagine a brushing style and not Jackson Pollock dripping paint. I placed a large cardboard sheet on top of the working counter top - a few wax drips landed in the wrong place, but the cleanup was easy.