https://www.amazon.com/ThreeBulls-Silver-Comfort-Butterfly-Replacement/dp/B01MSMCXPD/ref=mp_s_a_1_13?ie=UTF8&qid=1529701953&sr=8-13&pi=AC_SX236_SY340_QL65&keywords=pin+backs

These are way way cheaper and easier to use than the ones sold at DL. However, you can find them EVEN CHEAPER at Michael’s or Joann.