I use metallics and specialty threads all time and have found you need to experiment. Topstitch needles are a must. Secondly you will need paper clips and tape. Postion the paper clips on the top of your machine and use them as thread guides in conjunction with the guides on the machine. Some threads like to be up above the guides on your machine thru the paper clips before going thru the machine guides. I have clips postioned for up threading and down threading.It will take some experimenting as different threads will want to be threaded differently. You may also want to try adjusting your bobbin tension as well.