I have the pivoting one above the Sarca in that photo - slightly modified. I cut down a stainless U-bolt the right size and welded it over the end to stop the rope coming out as with the height of the Sarca, you can't put the pin in. You also have to be careful as the anchor comes over the roller as the shank of the Sarca will jamb in the roller if it comes up sideways and doesn't turn quick enough as you retrieve - you only do this once as it is an absolute prick to get out - had to put on shoes and kick the crap out of it.