Brit helmet sizing

[Art]

I have a couple of British military steel helmets. A Mk I and a Mk II. The headband part of the suspension of both is very similar and appears to have no method for adjusting size at all. Both of the ones I have appear that they would probably fit a 10 year old boy.

If there is a way to adjust these I'l like to know about it. I didn't get them to wear so that isn't the issue. I just have trouble comprehending that the Brits would build all these helmets with no provision to adjust the suspension, which by the way is attached by a rivet to the crown of the helmet.

[Art]

Mess up on my part. One helmet is a Mk I the other is a Mk IV with the push dot liner attachment

[Sunray]

I think they were made to sit on top of one's head as opposed to like a hat. The W.W. I pictures I've seen always look like that.