Website: thingiverse
Author: couturo51
Price: Free Download
File format: .Stl 3d printable
Description:
There is a chamber to insert the mechanism at the back. See the mechanism on amazon.https://www.amazon.ca/gp/product/B07SV2X1F9/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1