My son is a lefty. I've converted a few electric guitars for him. All you really need to do is just reverse the nut and the strings, and move the strap button to the other horn.
The knobs and jack will be on the top edge of the bass and will probably interfere with your left forearm.
The bass will be unbalanced and will probably have significant neck dive because the strap button is now on the shorter horn. You might get by with a very wide strap with an agressive texture that really digs into the fabric of whatever shirt you are wearing.
I suppose you COULD rout out a control cavity on the other side of the bass, move the stuff over there, figure out something for a reversed cover plate, and also figure out something to fill or cover the now-empty original holes, but that would be quite a bit of work and would seriously affect the resale value.
You will probably be better off selling that bass and using the proceeds to buy a real lefty bass. But of course that would be painful in its own way since pre-eb's are definitely special, and a lefty Ibanez or MIM Fender just isn't the same kind of special. However, if you can put up with the knobs and jacks on the top edge and the neck dive, the only non-reversible thing you will be doing is drilling one hole in the short horn for the strap button. This hole can be easily filled and finished so you can switch it back should you decide to sell it.
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Last edited by scottbass : 03-15-2013 at 03:54 PM.