Now the helmet is painted I wanted to complete it with a liner. I considered buying an old original liner but these are hard to find and very expensive. Besides that, I have done so much work on the helmet I no longer see it as completely original and I think it's better to use old original liners on helmets that are not worked on so much. So I spent time looking around on the internet. The first thing I needed to do was to learn about German Helmet liners. I found a lot of information the internet like on my favorite website World War Helmets
http://world-war-helmets.com/home.php
I found a reproduction liner at a militaria website that ordered together with 3 rivets.
After installation of the liner, it was found a little too small:
![Restoration of a German M40 helmet Part 7](6744/96016744/pics/3279081130_1_4_yQFM7syK.jpg)
This picture shows the markings on the liner:
![Restoration of a German M40 helmet Part 7](6744/96016744/pics/3279081130_1_8_0867f2GD.jpg)
The measurements of this reproduction liner are: 62cm and between the front holes 14cm.
![Restoration of a German M40 helmet Part 7](6744/96016744/pics/3279081130_1_10_A0spxt2x.jpg)
I wasn't really happy with this liner so I spent more time studying liners.
Some measurements on my helmet:
The outside measures 65,5cm, the distance between the front holes is 17cm.
The inside is not easy to measure but is between 63 and 64 cm. So this is a size 64 helmet.
So dispite the markings 64nA/56 on the liner, the measurements are not correct.
This is a lesson learned. I'm not going to mention the sellers website of this liner in this article since I'm using this seller a lot but I do want to advise to measure your helmet and ask a seller about his product measurements before you actually buy. I have used this liner in another German size 62 M35 helmet after drilling 2 new holes in the liner for the front rivets.
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