what is this hole on my swingarm for?

[strang]

This is not my swingarm but is a picture of the same one on my bike.
What is this hole on the top side for?

 

[CDNTX650]

chain guard mount?

 

[osteoderm]

Definitely the chain guard.

 

[strang]

of course - rarely see one on an xs it seems so forgot they even existed : )
osteoderm - you've got me prowling fairings on ebay.