Honda 16t cush front sprocket peace.

[kenn]

Strange then that a drill bit passes clean through the rubber from one side of the sprocket to the other.

[AlanH]

Well, the drill must have got lucky and hit a hole that is used to anchor the rubber to the sprocket.

[btbloke]

The rubber is purely there to absorb the impact of the chain links hitting the sprocket as they are pulled onto and around it by the teeth. it just makes it quieter and a smoother engagement of chain to sprocket,if you cut some back on an old knackered on you'll find it's all one piece of steel covered by rubber that passes THROUGH the sprocket to keep it's both sides attached. I guess you passed a drill through one of these moulding holes.I did play with the idea of taking the rubber off and retro fitting to a jt sprocket but found it is moulded on and obviously baked on in molten rubber form by the factory.