Originally Posted by Lori L
I haven't gone to the extreme you have ( don't have the red line) but I also have added a 1/4" guide to my throat plate using 1/4" quilting tape built up in several layers. I found using only my pressure foot to guide me made me inconsistent and I'm not sure why. Probably as you suggested and I wasn't focusing my eyes on that spot. I have found since I placed my tape guide to my throat plate I am very consistent with my 1/4" seams and I find my eyes tend to go from the pressure foot and the needle back to my 1/4" tape guide and things work well!
Throat plate? Do you have a front load bobbin? My bobbin is top load so I can only put the rubber bumper guide on top of the plastic lid I remove when I change the bobbin. If you have pictures you will give others a visual to follow if they want to set theirs up like you have. I really appreciate the response and related to your focus spots. Thank you.