B33 crankpin oil feed grub screw. Please help

[Malc]

Hello beezer bods.
Having just rebuilt the engine on my B33 and pretty much every internal part replaced I was disappointed to find that I was still leaking oil from the timing cover breather. So when I came to check the oil pump was turning properly found that it had become tight. When I dropped the sump plate off I found a little grub screw sitting under the gauze filter!!
Firstly I have no idea where it came from (although the parts book says it's a crankpin oil feed grub screw) and secondly what its purpose is.
Can anyone please help me identify the location and function of this damn grub screw as all literature I have (and that's quite a lot) doesn't give me any ideas.
I thank you in advance.
Forgive my stupidity.

New to the forum

Malc

[JulianS]

If it is the crankpin grub screw then it screws into the crankpin to seal the oilway drilling. If not in place there will be a significant drop in oil getting to the big end.

[Malc]

Thanks for the reply Julian.  I have the joy of stripping the engine again yippee.
That'll teach me to have someone else do things to my baby. We live and learn.
Thank you.   
Malc