Hi Dave, I've rebuilt the second filter and installed it back in the 7150plus (where it is working fine). I kept a photo record which I've combined into a 2.5Mb PDF. I can email it to you or, if someone wants to host it, I'm happy to have it available to all. Cheers, ian Link: www.n4iqt.com/solartron/solartron-repair.pdf Stanley