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Oilway plug screw?

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Hello again

I'd like to know what item number 6 is on the attached. When I found this on my own bike it looked like a sheared off bolt, i.e. no visible head. Is it just a grubscrew? What sort of head should it have?

Attachments plug-screw-jpg
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It should just be a slotted grub screw and the casing is normally peened into the slot on both sides to ensure that it can't come undone.

The gallery is a left-over from the machining operation and the screw shouldn't really need removing (unless perhaps the cases have been blasted, for normal cleaning it's not necessary).

 


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