Can steerer tube be made longer?

[Retrorockit]

Holland Bike sells RST steerer tubes separately. I've heard of them being used on Marzocchi forks. Since they fit the same headsets they may be generic. I have one sitting around just in case but I haven't tried it yet.
https://hollandbikeshop.com/en-gb/advanced_search_result.php?keywords=RST+Steerer

 

[bikeworkshop]

SIDS will have an alloy steerer

In steel yeah, alloy steerers will (probably) have much more wall thickness and smaller id.

Alloy steerers are never threaded - for strength reasons - so never take a quill.

Ahead gave us the opportunity to use aluminium as the steerer material.

There are discussions on this thread about extending steel and aluminium steerers, threaded and unthreaded/ahead.

I don't think anyone had brought up carbon composite, but it's not very retro
And I haven't seen any mention of Headclip, but that's Too Retro

The different materials and styles demand different approaches.

 

[novocaine]

Alloy steerers are never threaded - for strength reasons - so never take a quill.

Ahead gave us the opportunity to use aluminium as the steerer material.

There are discussions on this thread about extending steel and aluminium steerers, threaded and unthreaded/ahead.

I don't think anyone had brought up carbon composite, but it's not very retro
And I haven't seen any mention of Headclip, but that's Too Retro

The different materials and styles demand different approaches.

carbon is easy, you just melt it and stretch it a bit.