That brush does not have a standard thread,the thread on it has lined grooves that takes a cone adapter.The best way to convert this brush is to put superglue inside the thread and superglue the angle adapter,you will have to say goodbye to the angle adapter though but what`s a couple of quid.What i do to make sure it`s in line is chalk the black adapter before lining it up in the middle,i do the same on the brush head with a coloured felt pen cos once it`s stuck it`s stuck and it`s so annoying if it`s out of line.You need to use plenty of water with this brush if using pencils,the bristles dry out very quickly as there mono bristles are different to that of the vikan mono brush,this brush works better if it`s fanned.This is the brush Peter also supplies.