I recently purchased this 1994 Lava Dome for $80 CAD on Craigslist. The stem appears to be missing the decorative(?) cap. What did it look like? There's also a crack in the headset collar - I assume I need to buy a whole new set?
Stem "top-cap" - don't know if anyone as found a correct size replacement, SJSCycles (UK based) do some top caps, but seem to remember these don't fit the Kona stems (happy to be corrected).
Re: Impact headset (and it's crack) - looks like its been severely over tightened. This will need replacing as the allen bolt that was over tightened is what stops the threaded collar (with the crack) from loosening.
What to replace it with:
Find a Impact headset on here or eBay - they come up from time to time.
Find Kona Control Centre headset, again on here or on eBay, very similar to the Impact but a little later.
Fit another correct size threaded headset