JK Aerotech Slick Mount

Recently while straightening up a few things and organizing I came across this nice little piece. I knew I had this one, I just put things in places not to lose them and I lose them. I've used and built a plane currently utilizing this setup. All cnc machined aluminum tank bank which uses a 35 mm film canister for a tank. It's a clunk as well and can easily be configured for a uniflow clunk if one desires. A very neat piece of engineering and the bolt pattern is for Sure Starts, Killer Bee and other production backplates. In my experience, I found the engine to run a bit long and this would probably suit the R/C crowd. Does anyone have experience with these mounts?. I'm somewhat contemplating selling this. I know these are not currently available. I'm curious as to those who have used this. I do know in my experience, the stock 35 mm plastic container broke due to a crash and I want to try the black ones as they seem indestructible. I was using the clear version of cansiter shown in the package which seems a bit more brittle. The picture shown doesn't show the engine mounting holes just the tank side. Ken