tvphotog wrote in post #11281265
The Markins M10 has a 44mm ball, the RRS is 40mm. For the money, I would definitely get the Markins; the larger the ball diameter, the more steady is the ball movement and the less is the potential for droop with a heavy lens.
Also, if you send the RRS release to Markins, they will put it on the ballhead. Markins also makes their own lever QR. It is easily adjustable to fit an RRS plate system and from my experience is a match to the RRS. The RRS release however is the tried and true classic.
Really no need to do that. A dab of blue Loctite on the stud or screw, assemble, and you're done. Takes no more than a few minutes, then wait a few hours for the Loctite to cure. Would be a waste of time to wait and take delivery of an RRS clamp, then turn around and ship it off to Markins for a relatively simple task. Just my opinion anyway.
OP: If you decide to order the Markins head, and still go with the RRS lever clamp, you will also need to order a 3/8-16 stud from RRS (not included with the clamp). This is what is used to secure the clamp to the ballhead. OTOH, if you order the RRS BH-40 ballhead with the lever clamp already attached (model #BH40LRII), there's no need for anything else.