Excerpt: This does the trick and is almost as good as the original. Fits my Manfrotto fluid head 504HD perfectly. But the metal pin included with the original base plate is now plastic in this replacement part. Really? I'm going to pay this much to replace the baseplate, and get a plastic part in my replacement where the original was metal? Weak.
Excerpt: This is a great solid metal plate but be aware the this does not include the brass plug at the end. Instead it comes with plastic pieces that can snap in and out. The small brass plug that usually has give when putting a camera on had to be drilled out of our broken plate and welded onto the new one since the plastic pieces just wont work for the amount of filming we do.
Excerpt: The Manfrotto Long quick-release mounting plate will be used for a second plate for my Manfrotto 502 fluid head. So do not have to change out my cameras. Now I can use my Canon video camera or my Nikon D7000 DLSR.
Pros: Easy To Use, Fits Well, Improves Tripod Function, Solid/Sturdy
Excerpt: The 504PLONG fits both the 504HD 75mm ball head and the 502 flat based head, and little else. Thank you Manfrotto for selling heads and mounts that have ALMOST the same plate but are not compatible. The 357 plate on their quick-disconnect mount is almost identical but the two are totally different widths. And Manfrotto doesn't make a quick-disconnect mount that takes the 504PLONG plate. Apparently the plate alone accounts for 1/5 the cost of a 504HD fluid head.