hotshoe

The other day I noticed something fall off my camera when I picked it up and with closer inspection I realized that my camera's hot shoe socket was completely broken! It is a Canon 5D Mark III This was the piece that fell off the camera. After some research, I realized it goes inside the hot...

I am trying to use an external flash with a wireless transmitter. The transmitter goes into the hotshoe fine. The issue is that the on-board flash tries to pop up and can't, because the transmitter is in its way. However, this keeps the flash from firing; the flash light (lightening bolt) is...