[Arran]

Also since motor run caps are non polarized, and typically AC rated, you don't have to worry about ripple, or ESR with them, they also do not dry out, and many have a fuse built in. I have one that came with a metal halide ballast, it's 24 uf at 480 volts, 50 or 60 cps, it's too large for the model 27, but a pair of 10 uf ones would probably work just fine, many come in nice metal cans similar to the old wet electrolytics of the 1920s and 30s. The main issue is that you want to get them from a reputable source, like Mouser, or DigiKey, and not Alliexpress or Amazon.
Regards
Arran