I sometimes use the twin needle on my Baby Lock Espire and the machine's needle threader does not work for the twin needles. There is a handy little gadget you can get from the sewing stores that will thread the needles. Not quite like a needle threader you use to thread hand needles, but you hook the thread into a slot and slide the thing down the groove of the needle till you feel it click and the sewing machine needle is threaded! I would have enough trouble threading one needle, but would never be able to thread twin needles. It really is easy to work and would work for your single needle as well as the twin needles. It cost about $4.00 and I just keep it with my machine tools. But, the single needle threader on my machines work really well. Although I have had a couple amchines that it did not work at all, even with many adjustments made by the dealer.