Set up of cartridge on linear tracking turntable.

Greetings all! I would appreciate some advice on setting up a new cartridge on a linear tracking turn table. Here is my best attempt to date. I just purchased a new Benz Micro Glider M2 at 0.8mV output. I installed it on the head shell, leaving the attachment screws slightly loose and the cartridge positioned as rearward as possible. Then, I took some kite string, made a slip knot, and attached it to the center spindle post. I assume a linear tracker needle should be set right at 3:00 (think of the platter as a clock). I took a precision square, placed it on the side of the table, pulled the string tight, and line of sighted the spindle center line, string, and straight edge togethere. Now, at this point I was going to tape the string to the side of the table so I would have a "straight line" at 3:00 to set the cartridge too. As soon as I let go of the steel square it was pulled by the strong magnet integral to the Benz. Next, my heart stopped beating because the boron cantaliver and diamond tip were sheared off! I now know to be more careful with ferros objects around MC cartridges. But, was my initial guess at set up correct? Thanks for the feed back.
P.S. I did not sleep very good last night.
Regards,
Lou