I would like to comment on the dowel/no dowel issue. It is my belief that the main purpose of the dowel is to make the tether shorter. In most cases, shorter tether makes the wrist strap take more of the power, reducing the needed grip strength to hold on. For those that use a thin diameter handle, the dowel helps provide the best holding power as it makes the tether the proper length. For those that prefer a larger diameter handle, the dowel could make the tether strap too short which reduces its holding ability and increases the needed grip strength to hold on.