As usual, Henry Posner of B&H comes through again. Here is what he says about the Anti-Twist Plate for the N90s/F90x: "There are two plates suitable for the N90s -- the one you have is for the camera with MB-10 grip attached. It's Stroboframe's #300BE1. The other is their # 300H35. If you don't use the MB-10, you should exchange the one you have for the other." On the Saunders Photo web page (which happens to be back up now), the chart shows the following: AT Plate selector chart Camera Anti-Twist Plate Nikon N90, F4s w/MB-20 battery 300-H35 Nikon N90s 300-BE1 Canon EOS-1N with BP-E-1 Battery Pack Canon EOS-1N with E-1 Power Booster It is easy to see how I confused the plates, because I ordered the plate that I thought was correct for the N90s/F90x (without MB-10). Note that the chart does not say N90s WITH MB-10. I will send an e-mail to Saunders Photo requesting that they add this clarification to their description. Thanks to jack ngan, Michael Doan, and Rolland Elliott for the responses. Cheers, Matt [EMAIL PROTECTED]