Try calling the site below it has a toll free number, they may have a suggestion for you.
http://www.mysewingparts.com/index.php?page=shop.product_details&category_id=18&flypage=flypage.tpl&product_id=2687&option=com_virtuemart&Itemid=71&vmcchk=1&Itemid=71 I know they require metal bobbins, my neighbor owns a few dry cleaners order his off of ebay. Will post the Ebay in another post.

Here is a link that might be useful: Tacsew manuals.

Wanted you to be able to see the bobbins posted below.
Neighbor said they tried using pre wound bobbins they did not work.
His other machine is a Consew 2230 both machines use the same size bobbins. Says machine may need the timing adjustment, make sure your threading with the presser foot up, HTH

Here is a link that might be useful: Ebay Bobbins