Kobi Ohanna

tamte
It sounds like you work at object level, but bring in character using Kinefx, since you are using rivets?

In either way in your case you can parent a Null object to your first Rivet and create Look At constraint on the Null to look at the second Rivet

Then parent the Shovel to the Null and orient in a way that it points along the look at direction

You can of course recreate similar setup at SOP level using kinefx constraints between hand joints or using APEX even though APEX may be unnecessary for this task if you are just parenting to mocap