Best cyclocross bike under £1000 and other CX chat

So, I (think) that I need to move the bung down in the steerer- is this a simple case of undoing it, striking it firmly with a hammer* to drive it down, and then retightening it?

Or does one have to cut the steerer down by ~2mm or so?

Sounds like you just need to lower the bung.

My Hope headdoctor is tightened to the inside of the steerer, independently of the headset aduster bolt. So that I'd just loosen and lower.

A cheap Hope copy I own uses the topcap bolt to tighten it to the steerer. So would just fall.

Yours is probably a better fitting version of option 2. Which means hammer time baby.