[msimon785]

Originally Posted by s_forbes

For modelling purposes, I've been using the pulley CAD models that you can get from SDP/SI's catalog: https://sdp-si.com/eStore/Direct.asp?GroupID=217

Click on the part number and then "3D CAD Models".

I must admit, I do exactly the same. Their parts library is extraordinarily extensive. If you are not submitting your CAD under the requirement that everything is an original model, I see no reason as to why you might not use a CAD library.