Sorry for the repost, but how do you make a part collide with everything but players?

local PhysicsService = game:GetService('PhysicsService')

PhysicsService:CreateCollisionGroup('Players')
PhysicsService:CollisionGroupSetCollidable('Players', 'Players', false)

local function disableCollision(obj)
    if obj:IsA('BasePart') then
        PhysicsService:SetPartCollisionGroup(obj, 'Players')
    end
end

local function setup(model)
    for i, obj in pairs(model:GetDescendants()) do
        disableCollision(obj)
    end
    model.DescendantAdded:connect(function(obj)
        disableCollision(obj)
    end)
end

game:GetService('Players').PlayerAdded:connect(function(player)
    if player.Character then
        setup(player.Character)
    end
    player.CharacterAdded:connect(function(char)
        setup(char)
    end)
end)
for i,v in next, game:GetDescendants() do
    pcall(function() if v:IsA("BasePart") and v.Name == "Handle" then disableCollision(v) end end)
end

This script above should handle most cases, you see all you need to do is loop through instances and use a if statement to check if its a part and its name is "Handle" you then disable said collision.

for i,v in next, game:GetDescendants() do
    pcall(function() if v:IsA("BasePart") and v.Name == "Handle" then disableCollision(v) end end)
end

In case the part was in multiple services I looped through the entire game, I used the pcall because some instances error if you try to do certain things on it, like checking the classname, but it might not be necessary as I could be wrong. Note that this will not cover cloning the handle parts or their ancestors, if its necessary to do so then you must manually do it or use the .DescendantAdded event.