Leaky rocker shaft bolt o-ring. Straightforward replacement?

[fizzlebottom]

I've got a single leaky o-ring on the rocker shaft (bolt = #2, o-ring = #19). Wondering if replacing without any disassembly is feasible. Far as I can tell, it should simply unbolt, replace o-ring in the groove, and bolt back up / torque to spec.

Anyone to confirm / deny?

[Volker_P]

As far as I remember this bolt is just the plug for the rocker shaft (6).
So basically it should be as simple as you assume.