Shift lever clearance

[Gzetero]

Dear all,

The shift lever on my GZ250 has a lot of movement to the sides (please see picture), it makes it uncomfortable to shift gears sometimes.

There is a noticeable clearance between the lever and the support (attached picture) and I cannot see any way to thighten it in order to diminish the clearance and movement.

Is there a way to fix this or any suggestion on how I can fix it.

Any help will be appreciated.

Thanks.