You have several options depending on what you plan to do with the B55. The simplest and easiest way is to buy the Markins ballhead without their Quickshoe clamp and then attach an RRS B2 LR II clamp onto the Markins. If you plan on using the RRS lever clamp from your BH55, you will need to remove it and then attach it to the Markins. Both the Markins and RRS ballheads use a 3/8-16 center stud. In either case, you will need a touch of loctite to seat the clamp onto the stud. If you are going to use the RRS clamp, you will need to break the loctite seal. If you do a search, you will find several threads addressing the issue. The alternative is to send the BH55 to Markins and let them remove the clamp and have it attached to the Markins ballhead.