Studding a 121x15x1.25 pre drilled 144 Ripsaw question

[race24x]

Has anyone put studs in one of these tracks? Do I need double backers or can I use round single backers? I want to order some studs from the internet, but I am not sure what I need for the Pre Drilled

121x15x1.25 Ripsaw predrilled with 144

 

[Bento]

Just did this on my new pre drilled track installing 144 Stud Boy Power Points. You will need 48 double backers and 48 singles. Also, just a warning, the pre drilled holes are very tight and they are a pain to put in. Your hands will be sore.