I take it the machine shop began with an ordinary piece of hexagonal mild steel bar that fitted the standard plastic-centered groomer blades, then machined the ends to fit your mower, plus provided an extra thread to suit the clamping nut that holds the stack of groomer blades pressed together. That sounds like a very neat and simple way to make a kit that would allow a groomer conversion to be fitted to any SB45. The main inconvenience involved is that the bedknife has to be removed, which in practice means you need a soleplate to be provided as part of the conversion. If you were doing that, you might redesign the soleplate to make it specifically suitable for grooming purposes, unless you happened to have access to SB45 soleplates, which I have always thought are a rare item.
I'm inclined to think that Steve (deviosi) had the right idea in making a surplus SB45 into a dedicated groomer. Otherwise you'll be regularly removing and reinstalling your soleplate each time you change the machine over to the other function, and this seems likely to jeopardise the frame alignment of the mower.
Perhaps this whole project is better suited to one of the cassette-loading types of reel mower, on which the complete reel and bedknife is a drop-in assembly?
