I am so confused!!! What is a "scant 1/4"" 1 thread, 2 threads, x# threads and who can see those threads? If you use the same 1/4" measure on your machine all the time then your blocks will be correct and will fit together. I have a Singer and I move my needle to the correct position to get 1/4" ( not scant) and all my stuff fits and measures correctly. An issue may come when trying to work with other peoples blocks since their 1/4" may not be the same as yours. Down with the "scant 1/4""!!!!!.