Its not my idea , and I'm not sure who came up with it ,but it works. If you have that set of handlebars
that are perfect , but could be just a few inches longer. Take a 2'' piece of solid 3/4'' rod. Shove half of it into your bars.
Cut off 4'' of an old set of junk bars and slide them on the solid stock. Leave a slight gap. Weld all around
and then grind down the weld. Slide your 4 1/2'' long grips over the added part and it will cover your weld.
Now you have your favorite bars that are 4'' longer than they were.