Repair to Singer 7422?

Hi Ken,
Thanks for your help. I bought my machine on ebay, it is obviously brand new and unused although I suspect the seller may have had it in the box for approx 8 months without using it - hence the possible lack of oil you suggest. I really do not want to return the machine as it is great but do you have any idea how much it may cost to get the bobbin winding problem fixed? Really appreciate any advice. Thanks again.

Den_15e
October 2008