Oilite bushes.

[Denis Sweeney]

Luck I guess, had new brake cams and bushes which were a good fit, certainly no movement between cam and bush and the bushes were a tight fit into the bush housing, used bolt and nut to pull the bush into place.
The Oilite literature warns against using anything other than very sharp tools and refers to the use of diamond tipped tools, certainly no grinding or blunt tools as these will smear the sintered metal and close up the pores which allow the oil to do it’s work.