Finally got around to removing the metal tab that bolts on to the fork crown from the front mudguard - not the one on my recently mudguarded MTB* but the green bike. I'd been meaning to do this for, ooh, probably a year, in order to increase clearance under the fork crown. The imminent falling leaf season prompted me to obtain the circular tuit. Removing the tab was easy - I thought the rivets might need drilling out but the whole tab just pulled off.
However, that was where the problems began. I then put cable ties through the holes I'd made a long time ago and fastened them round the shoulders of the fork crown. My idea was that without the tab, the mudguard could be snugged tight against the underside of the crown, ensuring free passage for leaves and mud. It turned out there is more clearance under the crown than the brake arms - and this meant the front of the mudguard was forced to bend down from the crown and it dragged on the tyre. The solution was to make new holes in the 'guard so that I could move the whole thing along - as if the tab were fixed to the back of the fork crown, which I think it's what's intended, whereas it had previously been fixed to the front (between crown brake mechanism) due to the design of the brake bolt. I then tied it on with cable ties, but not so tight. This probably hasn't gained any clearance between guard and tyre compared to how it was earlier, but it has put the little mud flap (or 'beaver tail' as I read it described on one website) lower down, so hopefully keeping my bottom bracket nice and clean this winter.
Also, I've saved weight - that tab and rivets must weight at least half an ounce!
For the curious, this mudguard is described as black, but it's one of those SKS chromplastics which look dark brown with stripes in the sun.
*Motor torpedo bike?