RandyBoBandy
Minister of Fire
It’s pretty easy to get to the cat on the 1945. Even though I own one it’s in a cabin and gets minimal use so I’m not super familiar with taking it apart. I do believe the are wedges of some sort that have to be removed then the waffle looking flame shield can be removed. The cat is sitting just behind this. If it’s the original cat it’s probably a steel foil cat. You can very gingerly blow some air through it to get any fly ash out of it. Those keyboard compressed air cans can work well for this. I don’t think I have ever pulled out the fire brick to inspect the refractory box so I can’t help you there. When you did fire it with the damper closed did you see the cat glowing?