well, if i remember correctly diameter was 1 or 1.5 mm, very thin.
And if i'm correct, the sexbolt screws are the same on T2 and T4. give it a check.
you could also try warranty, payable service.
I found my P2, after some use, to have the small sexbolt screws unwind themselves. No thread lock was used , so ... QC.
I remember i wrote about it, with pics in the P2/P4 topic