Check the old thread on the first few pages or so. Might be better pictures there. If they are of no help then let me know and I'll take some more and post them. It's pretty easy to do. Take either some thin aluminum or a plastic bottle cap and grind/cut/whatever it down to a disc that will just sit inside and snug against the back inside of the F27C mount. Epoxy it in place. Now mark and drill your motor's mounting plate holes onto the back. Pay no attention to the 27C's motor holes if they don't line up. You don't need them. If you used a bottle cap then just heat up a small nail and melt out the holes where you want them. Best to use something like button bolts with washers and nuts but you can just use sheet metal screws. Regardless of what you use be sure to dab some nail polish on them to prevent them vibrating out. I like to do this even with the grub screws on my motors to prevent this. The nail polish will easily crack and allow you to remove it later.