Ha! I have a 40-year-old Optimus 111b -- still stored in my hiking "junk" box. That thing must weigh 24 ounces or so ...empty! We actually backpacked with it a few times. Steel case, steel kettle supports, heavy brass stove structure. And noisy. But it could sure put out the heat.

I found these youtube videos:     Optimus 111B camp stove

This guy doesn't pressurize the tank, and fusses with bottles to prime. (His fiddling with the pump is funny.)
    Optimus 111 Hiker Stove

Correct lighting method:   Pressurize with pump. Open the valve and let a little fuel run into the bowl. Close valve. Light and burn (about 30-60 seconds). When flame is almost out, open valve to allow stove to operate. Once burner is fully heated, open completely for full burn.

Wagga will like this video:
    World Record Optimus 111 Stove Lighting