This item from Cardas Audio does the job. It's a great product and very easy on the eye.
When I owned Music & Sound imports we made suct a tonearm box, in fact I thing we were the first to offer it (1982 I think) when we imported the CJ Walker turntable. I currently do not offer such a devise, but would certainly consider offering it again if the demand from AudiogoN members indicated a need for it. It would be very reasonable priced (below $100 would be the goal) and would be sold direct and not through dealers thus keeping the price down. Comments Please.....