Compatible B41.50 up to B41.53 included.

How to use if you create mods depending on it
1/ Ensure your Lua script is called after this one
2/ call TweakItem("ItemName","ParamName", "ParamValue")
e.g. TweakItem("Base.Bag_Schoolbag", "WeightReduction", "100"); -- this makes all items inside Schoolbag have no apparent weight as long as the bag is carried on back or hand

How to activate
1/select this mod (for your save or for your default mod selection)
2/select all mods depending on it (for your save or for your default mod selection)
3/ Tweaks are applied on game load, therefore:
3a/if you start a new game it will be active immediately
3b/if you load an existing game it will be active for objects that were not loaded prior to that mod selection

How to deactivate
1/ deselect all mods depending on this one. (for your save and for your default mod selection)
2/ deselect this mod (for your save and for your default mod selection)
3/ return to the desktop
4/ restart the game

If you activate ModOptions [https://steamcommunity.com/sharedfiles/filedetails/?id=2169435993]:
You can activate Verbose mode from options menu and see all modifications done (default = false)
You can activate Rollback mode from options menu and undo SOME modifications when going back to main menu (default = false)
(Yeah, only SOME modifications can be Rollback: Java Item class limited interface and my limited knowledge of Java & Lua are in cause. Any advice on improving this point is welcome.)

Some properties need to be changed at game boot time to take effect. For your expected changes to be applied on these you need to restart the game between each activation/deactivation of any mod tweaking items.