Did these last year, and just encountered them again when we decorated.
Gather some acrylic scrap and give these a try… edgelit by the bulb. Just grab your calipers and measure for the bulbs you have. I have two different sizes on the strings we have accumulated.
The yellow is frosted, but I think the clear works best for this.
If I had it to do over again I would engrave the inner cutouts on each arm instead of cutting them out. I’m going to have to whoop up another one to see if I like it better.
I had a design last year that did this… made a gojillion of them.
They are completely consistent; but my cheapo bulbs aren’t… friction fit some, slid off lots, and broke a couple trying to get them on, then deciding it was tight and trying to get them off.
You must be using some nicer lights than mine.