I
Hi
Sorry to see your oil pump probs very disheartening
It looks to me like it has drawn in some dirt from some where or the tolerances vere tight in the first place causing it pickup
You can't trust anybody or anything when it comes to engine building
Back in the Summer I had to have my sapphire engine out after only 500 miles as the (high pressure) pump I fitted had a faulty spring this wasn't a Burton pump but from another well known supplier
I did manage to get another pump and some compensation from them for my time
So measure everything
Clean everything and keep your fingers crossed
Best of luck Tim