I have the Bushnell (so called) 'Professional Bore Sighter' collimator that came with three adjustable arbors. Unfortunately, no arbor for the 17's and 5's. Now I see that Bushnell has a 'Deluxe' collimator that comes with 15 fixed arbors. Can't find a description of how the 'magnetic' attachment works so I'll ask: will the new arbors work with my 30 year old collimator. There is an 'outlet store' 10 miles down the road where perhaps I could get just the arbors if they are interchangeable from one (collimator) to the other. Thanks...