With some vintage Optimus 8 stoves, there is no nut cast into the fuel feed pipe.
This makes disassembly to service the wick or unclog a fouled fuel line difficult. It is quite possible to break the fuel feed/vaporizer by trying to remove it through applying force to the spindle housing or the the small “stilt” that supports the burner. Then your stove is toast!
Here’s a simple do-it-yourself tool you can make. To remove the fuel feed/vaporizer body from the tank, make a block of wood. Drill a hole through it just the size of the fuel feed tube.
Then, cut it in half lengthwise. A thin-bladed saw such as a bandsaw works well for this so that you remove the least material. You could also use a Japanese pull saw if you don’t have machinery.
Clamp the block around the fuel feed tube in your bench vise or with a big clamp. Turn the tank counter-clockwise by hand to unscrew the vaporizer from the tank.
You can then service a clogged or charred wick, replace the wick or what have you. Enjoy the blue flames from your service work.