Ok, I'v looked high and low for a cyclone to buy but it seems that everyone is sold out!!! Every time someone has a really nice performing rba....it's out or not being made any longer!!! Uhhhhh!! So, me being a draftsman and machinist in a former career, I'm gonna make my own line of top caps for our REO's. If someone could be so kind as to measure ( with a micrometer ) the inside dimension and the depth of the cyclone top cap that would be a big help. Please PM me with the info. My idea will be to make these out of stainless steel. They won't be the normal round style cause that's boring IMO. I'm thinking square, pyramid and different styles and shapes. Oh, and yes they will have AFC and fit different types of bottoms. I'm going to make any promises but I will give it a shot.