Universal Prop Mount v2 20mm STL
The Universal Prop Mount v2 is a generic design made to fit anywhere on a coro prop where there is free space and is made specifically for 20mm conduit. The rectangular base measures 112.5mm x 45mm.
For those in the UK, the link below is where you can get the conduit.
Note: This is a digital purchase for STL files and not a physical product.