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Drilling the stuffing tube hole thru the tunnel bottom isnt that hard on a single set up. First intall the strut and the motor mount. Then install the motor and collet. Insert about a two inch of 3/16 brass tube in the collet and trim/position it so it touches the tunnel floor (you may have to pull the motor or collet off serveral times till you get the right length of tubing). You now have your spot for the stuffing tube hole. Get a Dremel with a carbide cutter (9903) and slowly grind untill you can fit a 1/4 inch suffing tube in the hole and up the 3/16 brass tube. The Dremel makes a much cleaner cut than a drill. Once your stuffing tube is bent and ready to be glued/glassed in, leave the 3/16 tubing in the collet while you install it to ensure good alignment with the motor.
If your motor is more parallel to the tunnel floor like the one pictured below, you will need a S-bend in the stuffing tube. In this case I put the stuffing tube hole on the 32 as far back as possible to keep the S bend in the center of the tube (as much as possible). This leaves me straight runs on both ends for cable alignment and adjustment. I still use the 3/16 tube in the collet for alignment when glassing it in.
If your motor is more parallel to the tunnel floor like the one pictured below, you will need a S-bend in the stuffing tube. In this case I put the stuffing tube hole on the 32 as far back as possible to keep the S bend in the center of the tube (as much as possible). This leaves me straight runs on both ends for cable alignment and adjustment. I still use the 3/16 tube in the collet for alignment when glassing it in.
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