The risers shown in the photos below came with the bike when I bought it used from a fellow rider some years ago. Can anyone ID the maker? My problem with the risers is no matter how much I tighten down the riser bolts I am able to still push the handlebars up or down if I press firmly on the hand grips. The risers just do not hold the handlebars securely enough. Anyone have a suggestion for a fix for the problem. I've considered adding electrical tape around the handlebars under the riser to see if that would improve the grip. Note in the photos below that there is space between the two riser pieces, so problem is not that handlebars are too small for the risers, they just do not hold the handlebars in place securely enough that the handlebars cannot be rotated in the risers. Machine is 2006 BMW R1200GS. Any info/suggestions appreciated.