Or you can get and adjustable fabric guide at Sew-Classics or your LSMG:
{
http://www.shop.sew-classic.com/Seam...l-SCF55415.htm }
The fabric guide is one of the OEM accessories that comes with or came with the Featherweights. It's mentioned in the owners manual with pics too IIRC.
I use these and the 1/4" foot with the guide a lot. Just depends on the machine and what type of presser feet it uses.
I haven't mastered sewing a straight seam without a crutch yet .....
Joe