Question re Phone Holder mounting

Dave Middleton

Finding my (electric) wheels
May 7, 2017
7
0
71
Scotland
Hi. Because of the Bell and a Kiox control unit taking up the non tapered areas of handlebars, I would like any ideas regarding mounting a phone holder (for .gpx file following) on my TAPERED handlebars.
Currently due to vibration, the holder slowly makes its way down the taper to the flat section(where there is no room) .
The holder attaches via a C shaped housing with a rubber gasket to the inside which is gripped when you tighten the screw on the housing.
Should I just superglue the gasket to handlebar and housing to gasket or is there another less permanent method I have not thought of?
Thanks