Used in commercial embroidery machines to add space between needle bar and hook cover

thingiverse

Commercial embroiderers frequently insert spacers made from nylon or polyfex, an exceptionally thin material measuring just 0.5mm, into commercial embroidery machines to provide extra space between the needle bar and hook cover. This recommendation is often applied as a temporary solution. However, it's essential not to utilize this fix in any machine that features plastic needle bar parts, as damage could result. For installation, carefully cut at the center of each hole to ensure proper fitment into the needle bar.