I've had to repaint some Gottlieb metal aprons and shooter gauges in the past and have used decals from Pinball Rescue, but with them down for now, I thought I'd put a file here in case someone needs to replace the blue/red painted image around the shooter rod.
Here's a link to a folder with 2 files in it - one is a Photoshop file, the other a png file. I think either should print with no background on water-slide decal paper. If not, maybe somebody with better Photoshop skills than me can help out with that.
https://drive.google.com/drive/folders/1LUfelyCIkamDuGvmi4UqKYKJCsxVZ9NR?usp=sharing
And here's a photo of one, printed at home on my inkjet printer on water-slide decal paper, cut out and transferred over. Big improvement over what was there before.