Did you know that huge thing from Half-Life 2 that helping stop the antlions was supposed to appear in the game? And I'm talking about Thumper (Restrictor) now.
Digging through the files, I found six sound files for Thumper. Looking into soundevents_mechanical_units.vsndevts_c reveals that this is not actually the same Thumper from Half-Life 2, but a smaller version of it - Mini Thumper.
soundevents_mechanical_units.vsndevts_c
If we replace the readonly_tools_asset_info.bin file with the original one, we will find something interesting.
In the search appears model combine_thumper_articulated, which (I say this with absolute certainty, because it is not in the Half-Life 2 files) is the model of the new Thumper, which was supposed to be in Half-Life: Alyx.
combine_thumper_articulated
Unfortunately, there is no model itself, but we can see the files it used and on which maps this model was located.
Referencing or dependings on combine_thumper_articulated
This is all that the developers have created for Mini Thumper.
My guessesI think Thumper was about the size of a fire hydrant and we could keep it in our glove pockets. It would have to be recharged from time to time, but if you overcharge it, it would explode.
In my opinion Thumper was pretty useless and would only add unnecessary action to the player.