I finally got around to finishing up the mount for the tablet. For those who don't know, the tablet is needed to run the OnX Offroad or Gaia app with pre-downloaded maps. Cell signal can not be counted on while riding on a lot of trails and unless you have a dedicated GPS, you need something other than the standard Garmin or Magellan. Either of those will mostly work in a public place, like Land Between the Lakes, but you will be missing some information. Running a tablet is a cheaper alternative than the Garmin Offroad model and the display is much easier to read on the trail than most dedicated GPS units because of the screen size.
Anyway, back to the subject at hand. The mount I bought would probably work better if the seat mount bolts were vertical instead of at an angle but they aren't. So, one has to work with what they have. Because of the way I have to bolt in the mount, the flex arm bounces around too much. It needs some bracing. I picked up a couple of Adele Clamps and some hardware from the hardware store and dug out some scrap pieces of 5/16" stainless steel tubing I have for another project. I crushed the ends of the tubing, rounded the ends so there isn't any sharp, pokey bits, and drilled holes so the tubing can be bolted to the clamps for the vertical brace.
It made a difference but not enough since there is still movement from side to side. Using another scrap piece of 5/16" tubing and some fasteners from the scrounge box, I made a horizontal brace that runs from the upper Adele Clamp over to a radio mounting screw. Now there is not a lot of movement, at least when trying to move the mount by hand. On/off road, the story may be different.
Where the mount is bolted to the seat.
Pictures of the bracing.
With the tablet mounted.