How would I make a dropper that drops a MeshPart? (Just so i'm clear, not "mesh" a "MeshPart")

wait(2)
workspace:WaitForChild("PartStorage")



meshDrop = true
--------------------
meshID = "rbxassetid://547028155"  
textureID = ""
--------------------


while true do
	wait(1.5) -- How long in between drops
**	local part = Instance.new("MeshPart",workspace.PartStorage)**
	--part.BrickColor=script.Parent.Parent.Parent.DropColor.Value
	--part.Material=script.Parent.Parent.Parent.MaterialValue.Value
	local cash = Instance.new("IntValue",part)
	cash.Name = "Cash"
	cash.Value = 5 -- How much the drops are worth
	part.CFrame = script.Parent.Drop.CFrame - Vector3.new(0,2,0)
	part.BrickColor = BrickColor.new("Navy blue")
	part.Material = Enum.Material.Glass
	part.Size=Vector3.new(-271.365, 60.291, -237.789) -- Size of the drops
	if meshDrop == true then
	part.MeshId = meshID
	part.TextureId = textureID
	end
	part.TopSurface = "Smooth"
	part.BottomSurface = "Smooth"
	game.Debris:AddItem(part,20) -- How long until the drops expire
end

tried using a meshID, but is just gives me this error 19:57:09.955 - Unable to assign property MeshId. Script write access is restricted

tried putting Mesh Part into workspace and changing this: local part = Instance.new("MeshPart",workspace.PartStorage)

to this:~~~~~~~~~~~~~~~~~ local part = game.workspace.Gem:Clone()

but nothing comes out of the dropper.
So can someone please help? Thanks in Advance