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Fortunately there are large quantities of NOS stock bolts still on the market - they must have over-ordered. Not the sort of thing you wear out.

I didn't ask them, but I doubt it would have been very much.
When rifles have been through a river crossing it's hard to dry out areas like this.

I saw one of these tools, and the brace for it, at the RAF club's boot sale in July - but didn't buy it, as I already had one. No doubt somebody else did ...