How to you unjam a Pfaff Hobbylock 788? The user's manual doesn't help. There is no thread in the machine anymore. It hadn't been used in a while (years and years). The post that holds the needle appear to be too mobile: can be pushed in an out of the top end lengthening or shortening and twists around either way,also--not super loose but fairly easily with a little pressure. Both movements changing sensitive needle position. Repair manual (not user's manual) anyone?