How do you make a dildo fucking machine?

I want to get fucked by a Woman with a strap on but my wife will not cooperate and I cant find a Woman in my area interested. I have seen machines built that you put a dildo on to a shaft and it moves back and forth. I would like to build one but I am not maniacally inclined so I was wondering does anyone know how to build something like this or where I can get plans for one?
If I get one made I will make a video of me being fucked with it and post it here. Thanks.