Useful Old Engineering items

I’m rolling Mining + Engineering on my Vulpera Hunter. I’m the kind of peron who needs to have maxed professions for each xpac so I plan on leveling everything. Are there any old Engineering items, besides the obvious Jeeves, that are still useful nowadays? Are any of the old explosives worth carrying around like Arcane Bombs?

the bommerang thing, thats usable everywhere, maybe frostbombs, not sure about the effect lvl

Goblin gliders are pretty primo. (Alas, not the tinker version any more, if you’re doing 8.3 content, but the normal ones will work well.)

Utility toys like the mailbox (MOLL-E) and the transmog tool (Deployable Attire Rearranger). Blingtrons for a little fun. If you do pet battles, there are several good mechanical pets. And mounts.

Jeeves
Loot-a-Rang
Moll-E
Nitro boost belt tinker
Goblin Glider Kit
Flexweave Cloak tinker
Goblin Glider cloak tinker
All the wormhole, ultrasafe transporters (gnome eng), dimensional ripper (goblin eng)
Reeves (from Legion) with Repair and wormhole options
All mounts and pets
Mecha-Bond Imprint Matrix
Gnomish Gravity Well

NOTE: tinkers cannot be put on items with an “on use” effect and at Rank 5 or 6 the new BfA cloak gets one.