If You Can Keep Your Head ...

I DECIDED to convert six of my artillerymen into Prussians by replacing their kepi-clad heads with pickelhaubed ones.

Infantryman and gunner before converting

The process of cutting off heads was fairly easy, and nothing will go to waste as the kepi-clad heads can be put on the infantrymen, converting them into French infantry.

After converting … now a Prussian gunner and a French infantryman

Supergluing the 12 replacement heads on the full batch of figures was a simple process ...

The full batch converted

… but gamers with more experience than I have of working with soft plastic will by now have spotted a flaw.
It turns out superglue is not-so-super with certain materials, chief of which is the soft plastic that Armies In Plastic uses for its figures.
I left the glue to bond overnight, but 24 hours later the heads came off before I could even wash and prime the figures.

As things stand … six headless gunners and six headless infantrymen

A quick surf of the internet brought a product called Tricky Stick to my attention: ttps://deluxematerials.co.uk/products/tricky-stick
It seems you use it to cover the two surfaces you wish to join. Once the surfaces have dried, you can use superglue as per normal.
I have ordered a 50ml bottle from Upstairs Downstairs of Sandown, Isle of Wight, for £9.50 plus £3 posting.