I have a Wein HS slave... I wanted to use with my Canon Flashs, but it doesnt fit. I tired sliding into my Canon 540EZ and the 550EX. it wouldnt go in. I have no problems sliding into the Nikon SB-80DX. anyone know why?? I wanted to use my Canon flash as an slave when I'm using my Fuji digital w/ SB-80DX.