Welding a part to a position but welds off of the position?

Linking to my old question I am trying to add a part to the players right arm directly at the bottom like how you would hold a tool however when it welds it welds off of the hand Like so: https://gyazo.com/db83adb960e9ef312c1bdf8e041e4564

But I want it to be exactly on the hand without needing to anchor the player in place. Im not sure what other weld would allow me to use a script to tween size and move a part.

This is a part of the script im using atm that causes the part to be offset from the hand.

local plr = hit.Parent
Limb:Clone()
Limb.Parent = plr
Limb.Weld.Part1 = plr["Right Arm"]
Limb.Position = Vector3.new(plr["Right Arm"].Position.X ,plr["Right Arm"].Position.Y - 1.25, plr["Right Arm"].Position.Z)
Limb.Spread.Disabled = true