1917 Bolts with extra hole added

[MOS-45B]

I have seen a few 1917 Enfield bolts (all Remingtons) with a very small hole drilled just behind the extractor groove at bolt front. The hole was at a 90 degree angle to the locking lugs and had a small set screw installed. Does anyone know what the purpose for this addition hole might have been?

Information

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[Chuckindenver]

gas excape hole, to help protect the shooter when a primer or case head fails.

[Bolo Badge]

In addition to the two standard "in line" gas relief ports found on, I believe, all M1917 bolts one of my Eddystone bolts has a small hole immediately adjacent to the locking lug. It also has a small set screw. If this is an additional gas relief port should the screw be removed? If so, what is the purpose of the screw?

Thanks

[Chuckindenver]

pictures please.

[MOS-45B]

[URL="http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=330776243445&ssPageNam e=ADME:X:eRTM:US:1123"]

Here is one example. Does this have a purpose or is it lame gunsmithing?

[Chuckindenver]

like i said, the extra hole is to help gas excape, common with later and replacement bolts.
the picture i want to see is of the screw...

[Bolo Badge]

Unfortunately I currently do not have access to a digital camera. I will post a picture as soon as I can. The only additional information I can give at this time is that the screw is very small and will probably require a jewlers screwdriver to remove.