A hole used to connect certain types of VelocityMotor together using a part. The whole assembly containing a Hole could be replaced with simply a Motor6D.
Unfortunately, since VelocityMotor and the RotateP and RotateV instances don’t seem to be active for some reason, I created a model in 2020 that allows you to fix these, called MotorFix. Roblox has appeared to have fixed some functionality, but due to a FE bug that has not been fixed yet, these instances do not correctly replicate the active connections from Part0 to Part1. Enabling and disabling the motor after it has been assigned to a network owner fixes the issue.