Copied from my G+ page :
After removing all the tape I had a slight issue with the size of the plugs . Now there is a red version available with a smaller diameter plug but only by 1mm or so . So i decided to make the eyelets slightly bigger with the drill bit . I had to eye up the diameter with the right size drill bit as these plugs are tapered as well as having a gripped surface . I then deburred the eyelets with the sanding cone . I also deburred the valve hole as it looked a little rough to me . The plugs then simply clicked (with some force) into place .
Nice !!! 
After removing all the tape I had a slight issue with the size of the plugs . Now there is a red version available with a smaller diameter plug but only by 1mm or so . So i decided to make the eyelets slightly bigger with the drill bit . I had to eye up the diameter with the right size drill bit as these plugs are tapered as well as having a gripped surface . I then deburred the eyelets with the sanding cone . I also deburred the valve hole as it looked a little rough to me . The plugs then simply clicked (with some force) into place .
Nice !!!