Is it possible to buy an extra QR plate for the 701HDV head (for my second camcorder)? I checked B&H and the Manfrotto site itself, and googled around a bit, but came up with nothing ...

Hi Graham,

You're looking for the 501PL plate, which can be found here:

Bogen / Manfrotto | 501PL Sliding Quick Release Plate | 501PL (http://www.bhphotovideo.com/c/product/553892-REG/Bogen_Manfrotto_501PL_501PL_Sliding_Quick_Release.html)

Yours,

Hoi

Awesome - thanks so much!