I'm trying to design a holder for a UV filter that will slip over the end of a photographic flash unit.  I have the sleeve for the flash and the ring to hold the UV filter.  I'm trying to figure out if I place the ring 25mm from the end of the flash sleeve, is it possible to have Solidworks connect the two to make a smooth transition?  The ring, of course is round, but the flash sleeve is essentially a rectangle with rounded corners and slightly tapered on the sides.  Is this possible?  Sweeps only allow for one profile and a path, and boundary wouldn't allow me to select the end of the flash sleeve as it contained too many entities.