I've been telling people you need 2 screws since before the M10 was released... Everyone told me 1 screw is all you need.
Can someone from Freefly please contact me and arrange to send me a second screw. The rotation on the baseplate is an EPIC FAIL. Freefly please respond to your angry customers who are losing faith in you.
The M10 comes with 2 (maybe more?), and it is not difficult to use them both with the Epic. Pick up a Gitzo 3/8" to 1/4" adaptor and you're golden. It's super rigid.
You also need to drill out your M10 Baseplate if you want to be able to slide the camera as far back as possible with an epic and heavier lens on it.
A thread adapter and two screws is the only way to go with an Epic or large camera. Always rock solid for me. Rotation is not an issue. http://www.bhphotovideo.com/c/product/503797-REG/General_Brand_NPTRB_3_8_to_1_4_20_Tripod.html