I'm wondering what sort of tool I should use to adjust the high speed compression of the Sachs shock on my 2005 Brutale S. The low-speed compression is easy: use a screwdriver. But the high-speed adjuster surrounding the low-speed screw has me kinda stumped. It's not hexagonal; it's round. It has two slots. What can I plug into that? Anyone got a good hack-- like, "use a putty knife!" or some other suggestion? I was looking at it and rifled through my tools but have not been able to conceive how to do it just yet. The manual's suggestion baffled me.