Is there a way to remove and improve the RopeConstraint?

I made a script of a RopeConstraint but ran into couple issues.

The scripts makes it so that when I click the mouse button it will shoot a rope.

The only problem is that I need to tell the script the length of the rope but I want it to be the length between the character and the point where my mouse clicked but I dont know how to make it. I also dont know how to remove the rope after im done using it. I tried to remove it but I cant and it wont work. Any help please?

local wa = game.Workspace.WebAttachment
local plr = game.Players.LocalPlayer
local char = plr.Character
local head = char:FindFirstChild("Head")

local uis = game:GetService("UserInputService")

uis.InputBegan:Connect(function(input, GameProcessed)
    if input.UserInputType == Enum.UserInputType.MouseButton1 then

        local attachmentA = Instance.new("Attachment", wa)
        attachmentA.Position = Vector3.new(input.Position)

        local attachmentB = Instance.new("Attachment", head)
        attachmentB.Position = Vector3.new(0,0,-1)

        local web = Instance.new("RopeConstraint", wa)
        game.Workspace.WebSound:Play()
        wait(0.2)
        web.Attachment0 = attachmentA
        web.Attachment1 = attachmentB
        web.Visible = true
        web.Color = BrickColor.new("White")
        web.Length = (input.Position),(head) --I tried to do something but, as you can see it didn`t really worked out.. I tried finding an answer by searching it via Google but couldnt find one.

    end
end)

uis.InputEnded:Connect(function(input, GameProcessed)
    if input.UserInputType == Enum.UserInputType.MouseButton1 then
        head:FindFirstChild("web")
        web:Destroy()
    end
end)