I have an older Bogen tripod with one of those hex shaped QR plate. When I attach it to a medium format camera like my Pentax 67 or Bronica GS-1, it seems to hold just fine for my purposes, but when attached to a large format camera like my Technika or Shen Hao, the force of inserting the film holder frequently makes it slip a bit, even though I do my best to minimize the force needed by holding the back apart.
now, it’s old and maybe the cork on the top of the plate just isn’t as grippy any more. I was looking at replacement QR plates, and in eBay, I can get what look to be Chinese aftermarket plates brand new for ~$15 with what looks like rubber tops instead of cork. I was thinking of buying a couple (also because I’d like to mount them permanently to my large format cameras, so I’m not having to move the plate.
has anyone tried these aftermarket plates? Is their build quality decent? Anyone have other ideas to get a more positive grip on the camera?