This is the diagram I was given by Wayne at the Speaker Exchange in Tampa, Florida. I used it and it worked perfectly for the (4) new RF-7III woofers which I purchased. They told me that the original RF-7 and the RF-7II woofers are no longer available. I used a Dremel tool and a very small carbide grinding bit to enlarge the woofer mounting holes. If you use a drill bit, it will enlarge the hole too much and you will end up using a washer because the head of the original screws will fall right through. The holes actually need to be enlarged on one side only, which is why I used the Dremel. I used the same bit for routing out the MDF so that the woofer would seat properly. I actually did all (8) by hand and after sanding the high spots, all four woofers
fit perfectly. This was actually very easy to do. I am closing in on 70 years old and I've been diagnosed with Parkinson's. I had one of my carbidopa levadopa pills and a couple brews to calm my shaking hands down and I think that I did quite well. I have taken pictures and will post them as soon as my wife gets home. I'm just learning how to use this laptop. Thanks for allowing me to post and share a little about myself.