hi all have just been offerd an overdrive a fairy one for 50 quid but it is noisy and needs a new syncrow to engage can the parts for these still be bought and can i get it rebuilt and serviced any where in lincolnshire .also will it still be a good deal if i have to spend a bit on it or should i leave it in my mates shed as i know theses are expensive to buy any way whats your thoughts cheers