This is the one I meant: Cooling Case Fans to keep VCOs in tune?
[edit] I just realised you wrote ‘dirty’ and I misread that as ‘drifting’. Afraid this ^ thread will be mostly useless to your case…
Yeah that’s what I went for, and in hindsight I’m happy I did. The routemaster has a MTA-156 footprint on the AC input, which has .156" lead spacing. Most screw terminals have a 5mm or 0.2" spacing. I was able to find some .15" screw terminals though. The holes in the PCB are large enough for these to fit.