Actually I made my own. Took a T/C rugged rod, aluminum, and made a lead filled handle. Use the standard brass bore guide with it.
On the handle I cut off a short length of one inch copper tubing, poured a little melted lead in the bottom then set the end of the rod in the tubing and poured hot lead around it.
When it cooled took a soft rubber handlebar grip for a childrens bicycle that is available at Walmart and slipped that over the handle.
In a short while of use the rod will come loose from the lead, so I just coated that section of the rod with epoxy cement and set it back into the handle.
With the weight of the lead it is a joy to use and requires no effort. The aluminum rod cleans off really well and does not seem to hold any grit.