I have always liked the HED3 wheels and have used them on two different bikes. I put one on the front of our tandem in January and wanted one on the rear but the spacing was wrong. By replacing the original fixed RD mount with a removable mount I created an opportunity to add spacers to the drops and reduce the spacing from 145 down to 130. I ordered a pair of Calfee titanium drops and modified them by cutting off the tabs where they attach to the chainstays. The LH side was a bolt on using the stock Calfee bolt and the two holes for mounting a disc brake. The RH side was more complicated, I had to drill and tap 3 holes in the titanium drop, a bit of a challenge but with some patience it was accomplished. The new wheel arrived today and I installed the spacers, spaced the wheel a few millimeters and the bike now looks complete. HED3 wheels front and rear.
I will order new titanium fasteners later this evening or tomorrow.