Adjustable weight exercise device

An adjustable weight exercise device of the type having a weight permanently attached to the end of a handle comprising, in combination:

• a cylindrical handle having an axis and a predetermined axial length and a first end and a second end;
• a first weight permanently attached to said first end of said handle and a second weight permanently attached to said second end of said handle, and each of said first weight and said second weight having a first preselected geometric peripheral configuration and a predetermined weight and having an external surface and an internal surface, said internal surfaces of said first and said second weights separated by said predetermined axial length of said handle;
• first walls defining a first threaded aperture extending into said first weight and second walls defining a second threaded aperture extending into said second weight, said first threaded aperture and said second threaded aperture co-axial with said axis of said handle, and each of said first threaded aperture and said second threaded aperture having a preselected axial depth;
• a collar having a projecting first end portion having a first diameter and having first external threads thereon and said first external threads for threadingly engaging said first threaded aperture and said second threaded aperture, and a projecting second end portion having a second diameter and having second external threads thereon, and said second diameter of said second end portion different from said first diameter of said first end portion, and said second end portion having tool accepting walls thereon for accepting a tool for rotating said collar to facilitate said threading engagement of said first end portion into said first and second apertures;
• said second end portion having an external end surface and an internal end surface, said internal end surface adjacent said first end portion, and said internal end surface of said second end portion abutting said external surfaces of said first and said second weights for the condition of said collar inserted into said first weight and said second weight;
• a plurality of add on weight plates having preselected weights and each of said plurality of add on weights having a second predetermined external geometric peripheral configuration and having central walls defining a central axially disposed aperture therein having internal threads for threading engagement with said threads on said second end portion of said collar;
• and at least some of said plurality of add on weights has walls defining a tool access aperture extending therein for allowing tool engagement with said tool accepting walls of said collar.