Years ago:
Steel bar with 3 holes.
2 bolt to both sides of repair to head with stands.
U bolt this to head.
On piece large ”bushing” in that point what u have to repair,under bar.
U have to measere first next thread size mm/inc.
Correct drill.
Bushing bore size for this.
Vacuun cleaner…..
I bored thru bushing in correct deeb.
Theads to head.
From machinery shop over size correct threads bolt.
This was oiling bolt too.
Works fine.
Bushing straigts drill.
Newer had issue.
(Cast iron head from famous racer here,head ”repaired”  plastic padding.So normal…..)