Annoying knock from camshaft front pulley area

[Charles P]

Camshaft location and end float are so often overlooked and not done correctly, the other thing besides this and timing gear lash which often causes knocking is dynamo end float.....there should be none. My personal preference to improving the camshaft location is to the thread the bush and use a stud as the Mag engines had, add Dowty washer under the nut ..... no leaks and a very secure bush

I agree. 
The peg and hole approach to location is a bit rubbish really

c