When my truck had a clutch replaced the mechanics removed a section of the drive train in which they did not have to touch. Upon collection of vehicle I asked why I had to tighten the removed part. It was not necessary to remove this part as later I found out they made a mistake and did not want to be liable for the damage that can be caused by tightening the part themselves. I am on Disability and to take the truck to another mechanic who specialises in the part (Differential) costs a lot of money which I feel I should not have to be burdened with.Improper tightening can lead to failure of the Differential and in doing so would cost a small fortune to replace. Question is can I take it to a specialist to fix their mistake and get them to pay for it? I do not wish to take it back to the car mechanic as he was very unhelpful in coming to a suitable conclusion. Thank you.