Leaders were correct about the Welsh making good quality rollers, perhaps? (12)

'good quality rollers perhaps?' is the definition.
I can't tell whether this definition defines the answer.

'leaders were correct about the welsh' is the wordplay.
'leaders' says to take the initial letters.
'correct' becomes 'right' (right can mean correct).
'about' means one lot of letters goes inside another.
'the welsh' becomes 'wheels' (I can't justify this - if you can you should give a lot more credence to this answer).
The initial letter of 'were' is 'w'.
'w'+'right'='wright'
'wright' placed inside 'wheels' is 'WHEELWRIGHTS'.

'making' is the link.

Can you help me to learn more?