@Calum Is that a DT200R 3ET swingarm? Very nice, I bought one from Japan and it weighed literally half as much as the DT125R steel version.
However the plastic mud flap that protects the rear shock wears the (basically priceless) alloy swingarm away at the rear of the linkage bearing over time so it can be helpful to install something to prevent this. A lot of people with modern Huskies, KTMs etc. JB Weld a coin to the surface of the arm as they're prone to it as well.
I considered all that mud and chain lube floating about to be quite a harsh environment in which to try and glue two pieces of metal together so on my 250EXC I used the plastic sleeve which you get inside one of those boxes of sticky labels they sell in the Post Office cut open and cable tied on. Worked very well and I reasoned when it wears out you can easily make another one, but you might want to come up with a slightly more elegant solution for a road bike lol.
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