without interference the downward curve of the extender portion 320 giving added room for the user 39 s hand the length of the riser portion 310 deters the skateboarder from sliding on the rail as shown in the figures the riser portion 310 has a thickness given by dimension u201c j u201d which in one version is about u00bd inch and a width given by dimension u201c n u201d which in one version is about 1 inch the proximal end 330 of the extender portion 320 is generally arc shaped to conform and attach to the curvature of the elongated cylinder 110 the distal end 340 of the extender portion 320 includes a generally flat rectangular vertical portion the flat rectangular vertical portion fastens to the riser portion 310 and being wider than the riser portion 310 has a dimension of u201c m u201d by which it overlaps on either side the riser portion 310 in one version dimension u201c m u201d is about u215c inch any fastening device 350 such as a bolt or rivet can be used to connect the flat portion of the distal end 340 to the riser portion 310 the riser portion extends by dimension u201c.