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Hi Sean,
Congratulations on capturing a 7904A - it is an astounding instrument. It was nice of John Griessen to offer you one of his scopes.

Most of the scope carts that are wide enough for a four wide 7000 scope have another thing you can add later on: The side rails that are mounted to the main shelf so they swivel with it are wide enough to accommodate a TM504 mainframe so four additional TMxxx plugin instruments can go with your scope at all times.

You will have to find the shelf Tek made for this purpose. There is nothing special about it so I made two of them for my own use and mounted two TM504 mainframes onto those side rails. The shelf is a flat surface and on the left and right sides it is bent up and holes are drilled in the bent up sides to mate to the side rails of the scope. By adding the shelf you actually strengthen the whole cart. Two shelves and two TM504 mainframes worked perfectly and allowed me to take up to 8 plugins where ever the scope was. the scope cart is so well built it was perfectly capable of handling the extra weight without any problems at all.

Dennis Tillman W7PF