I bought a satnav mount for the Sprint GT that fixes centrally on the yoke, replacing the fork stem cap. The cap itself is like a large, rounded affair for which I dont have a socket or spanner big enough. I could apply a monkey wrench to the job but before I do that and end up damaging something I thought I’d ask how other people take these off.
From memory of my ST it was something like a 24 mm socket. Cover it with clingfilm or tissue to avoid marking it. Measure across the flats and get yourself to Halfrauds. Or wait until l get back from Spain and borrow mine 
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Don’t you DARE !!!
A correct sized socket is acceptable, but ideally you want one of these…
Probably the right one but your workshop manual should list the correct part number.
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If you have a little pin punch and a lump hammer, you could tonk it round in an anticlockwise direction with the pin in one of the holes and your right arm braying like Thor! (I asked the git who did my ratter)
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I did contemplate the Mjölnir and pin option (Asgardian tools have a good reputation) but the cap looks quite soft and I was concerned about damaging it that way, too. Perhaps it’s just my over-cautious imagination.
I can see a socket might do the job but those rounded corners look like a recipe for slippage.
As usual the special tool is stupidly expensive (£18) for a one-off job but then again, I’ve been thinking about a forum toolkit library idea so maybe this could be the inaugural item on the virtual shelf.
@Col_C Some of those tools list the model. This one doesn’t. Is that because it’s a generic one-size-fits-all with exceptions for Tigers, Daytonas and Speed Triples?
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Yes, it is just fairly soft anodised aluminium (not hard anodised), so very easy to damage. If going the socket route only use a single hex, NOT bi-hex, and wrap the nut with a layer of “insulting” tape.
You can get adjustable pin wrenches but then you’re only locating on two holes, they WILL deform. (Plus it should really be tightened to spec with a torque wrench)
If you’re anywhere near as OCD as me you’ll be looking at the damage every time you swing a leg over the bike. 
I always justify tool costs by looking what it would cost paying for the shop to do it, so this equates to less than half an hour’s labour.
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I’m happy to buy the tool, I just want to make sure I order the right one.
I checked with the supplier of the tool on fleaBay, GB Motorcycle Products, who pointed me to this item:
They were quick to respond, polite and helpful.
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Why don’t you JUST ASK ME to borrow a socket?
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It’s not a socket in the normal sense. Anyway, @Col_C shouted at me. 
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Which seems to imply Triumph have at least three different variants of stem cap. 
A least four, in fact. Probably more.
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