I wound the lock stops out so that the bars locked out before the m/c hit the clocks.My logic being,that even though i had reduced my steering lock with the stops,the end result is the same when they hit the clocks!!Also,gained a bit extra by dropping the leaver slightly.
got a Mate that makes replacement ones for Harris Clip-ons, i get hold of a pair before he puts the locating groove in as its in a different place on the Harris ones, then I have to taper the end slightly and add the groove in the right place to suit the standard Ducati clamps.
The method I used to lengthen the standard bars was to remove the original plastic end plugs and machine up some new longer ones in ally. which I then loctited in place. Simple if you've got access to a machine shop, or a mate that does.