Ross 1910 - receiver bridge screw threading

[Promo]

Does anyone know which threading the two screws on the right side of the Ross 1910 rifle have which affix the bridge the rear sight is sitting upon? Need it for restoration; original threading was damaged, I have the screws and bridge, everything was repaired but to properly thread the hole I'm in need for the correct threading.

Thank you!

Information

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[AGB-1]

I posted your question on the rossrifle.forum. AGB-1

[Bluenoser]

#5 x 40 NC
Pics of the repairs to the receiver would be appreciated.

[Promo]

Thank you! I hope I‘ll be able to get a thread cutter - or any recommendations where to buy one?

The rifle is the 1910 W&S sniper rifle. The receiver is awfully damaged. It has had a bullet hit in the magazine cutoff area and currently being fully rebuild. Some threads cannot be repaired and parts need to be welded in and re-threaded.

[browningautorifle]

Thank you! I hope I‘ll be able to get a thread cutter - or any recommendations where to buy one?

Yes, easy enough to get here... 5-40 HSS Tap and Die Set, Thread Tap and Round Thread Die Right Hand HSS Taper: Amazon.ca: Tools Home Improvement

[Bluenoser]

No. 5 x 40 NC is a standard size this side of the pond. Send an email or PM if you cannot source one in Europe

[Promo]

Before I order something wrong, please forgive me the maybe stupid question: is 5 x 40 NC the same as 5-40 that Jim has posted a link of?

[browningautorifle]

is 5 x 40 NC the same as 5-40

Lots of possible sources over here...Ackland Grainger is another...

[Bluenoser]

It is indeed. The "NC" is an abbreviation for national coarse.

[AGB-1]

Could you post some pictures of the 1910?