I’m changing the vvt solenoids and the last one won’t go in all the way

Hello, I'm sorry to say there is no advice to give via the Internet for this. There does not appear to be a "trick" - I would just wonder if it's the correct part for the location? But this is one of the things we can't know, not being there, not knowing the condition of the vehicle, the source of the parts, the technical resources you have available. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops