I finally found a spare hour and got around to making a couple of seat belt guides last week. I made them from bright-annealed mirror-finish stainless-steel and sort of copied Adam's picture of his Japanese guides. I'm not sure they improve the retraction of the belts but the belts dont slip out of these like they did from the plastic originals. Plus they cost nothing for me to make I refused to pay the silly money for Japanese or German guides. I fixed them with a couple of cap head screws which I thought would give a butch industrial look, but I might countersink the holes and use countersunk screws instead. To try and make the belts retract better I'm going to try some of the ideas on here for retraction improvement. My Copen's MOT is due soon and I don't want to fail because of the belts.