dont bother with sand, get a tube of clear bathroom silicone sealant, put about 3 inches of rubber tube over the end of the tip so it extends inside the bar as long as the switchgear, then squeeze a blob in till it fills the diamiter up, let it dry then fill the bar with your choice of weighty object, lad shot, depleted uranium etc) then plug the outer end with silicone too.. alternatively, you could just plug the whole end 5 inchs of handlebar with silicone.