I created this tool for servicing a DVO Topaz mountain bike shock. The design of the Topaz bladder requires that a tool be used to grip the eternal schrader threads to push/pull it into place. This is NOT for removing the valve core. It threads onto the external schrader threads--in this case it allows for easy installation of the Topaz bladder--much better than using the head of my bike pump. Someone might find it useful for another job so I thought I'd post it here.
The author marked this model as their own original creation.