I loved the idea of the jig and bought an aluminum one and works well, but then I found a plastic version that I like even more since it is more self lubricating or slick since it is the plastic and works well. I bought mine from Amazon here in the U.S. Maybe these can be found elsewhere also?
https://www.amazon.com/gp/product/B0063KKTR0/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1#feature-bullets-btf
https://www.amazon.com/gp/product/B0063KKTR0/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1#feature-bullets-btf