With the Avidyne mount tray clecoed in place we drilled the #28 holes to secure the tray. Then we removed it and deburred the holes. Next we were ready to install the GPS, Comm, G/S and Nav cables to The back of the tray, but I was short the Nav cable. I ordered a RG400 with BNC's cable for the wing root to IFD. Amazon will have it here tomorrow.