I have a free C4D Xpresso rig of an adjustable bolt for you today! This is by my friend Ivan Van De Velde. You should check out his work here: facebook.com/ivan.vandevelde.37
The rig has a lot of parameters you can choose including bolt head, thread width, height, additional washers/bolts etc. Super handy model so make sure to thank Ivan for sharing!
To get it just join our e-mail newsletter and you will get a free download link along with all of our other freebies.