My drivers seat is a bit out of shape .some dope did it for me about a year ago and made a hash of it,so I was thinking of redoing it myself has anyone tried to do this job or is it a job for an expert.,are any special tools needed can the base cushion be bought any where apart from the main agent about £200 I think or can they be made up,and what should the correct material be.The springs are all good. Many thanks. Mike.