Same with the heel , if the tech insert is working , keep it , but there needs to be something more than just a rounded heel .
If the NTN duckbutt is working and easy to manufacture it can continue , if not , it can be redesigned .
Same with the heel , if the tech insert is working , keep NTN duckbutt , but there needs to be something more than just a rounded heel .
If the NTN duckbutt is working and easy to manufacture it can continue , if not , it can be redesigned .