My wing mirrors are a bit floppy, so I ground down an 18mm spanner and filed it open until it fit (I think it may have been a 19mm nut but didn't want to butcher a usable spanner

So I've removed the wing mirror, tightened up the 10mm nut that goes on the inside and refitted the wing mirror and tightened up. They are now both nice and tight.
The only sloppyness I've got is the horizontal left to right movement, I guess this is tightened by the dome nut at the bottom of the arm? Is there supposed to be a spring or something inside to act as resistance? I've tightened as much as I can but still loose.

Also, I'm baffled that the main wing mirror screws directly into the door with no gasket or seal? Paints a bit scratched up as a result. Seems the beetles do, and you can buy these separately.
Do the Type 3's need a seal too? If so, are these available separately or will a beetle seal fit?
Cheers guys.