Haha, sorry bout that xD The bow was in fact a typo, the bow is a staple, and should definitely be there. However, the drill seems like an original idea, I'm just not a fan. Bombs not being present presents (lol) an issue, of the timing, etc. There are so many uses for bombs if thought through correctly; it's just hard to come up with an adequate destructive weapon.
Imma let yall in on a bit of a secret: The destructive secondary in the game I'm designing with a few other people (3d, mind) are called the Gearfists, or Golem Fists. Pretty much, Link loses his sword and shield, in favor of a boxing type melee combat. With these mechanical gloves, he is able to power doors, pull rusty switches, lift bigger things, etc, as well as punching rocks and walls to crack them. Charges are a focus in my game, as Time Stop is the key ability, sort of like PH, but wayyy less broken. Charges require magic power, but power up the "Standard Weapon", ie, the Sword / Shield, or whatever else is used, in this case, the Golem Fists. These charges, cuz there are different kinds, have different effects on both the time slow and the use of the weapon. The charge could increase the knockback of the weapon, etc, while making Link slower during the pauses. Stuff like that. End spoilers.
The Drill functions for what? Digging and breaking rocks. Bombs break rocks, so it's really only good for Digging. (My issues with the mole mits and the pegasus boots in MC were simply that they were unwieldy and used very rarely, I avoided them as much as I could). The Drill also feels unweildy. I loved the hammer in WW, and the Ball and Chain in TP, they were well balanced, and easy to use. How about something that a ton of zelda people would love to see, and the diehards wouldn't fuss too much about, seeing as how TP used something similar? A Hand-Cannon! (A steampunky, heavy, clunky cannon)Examples:
You're faced with a room full of previously "diggable" dirt. Instead, you pull out a mini-cannon, which makes you slow to a crawl, unable to change directions, and constantly facing the same way. Strafing, you line up with the most dirt, and let loose. A cannonball launches out, obliterating the stuff in a straight line in front of it.
Or
You are fighting a mini-boss, boss, or whatnot, that, when stunned, takes a few hits. Instead of trying to leap over the cracks in the room, ala Ganondorf OOT, you simply whip out this bad boy, charge for a few seconds, and fire before he gets up. Incredibly powerful shots, low mobility.
And, for a TP esque feel, the cannonballs could be a One shot thing. Like, you have one ammo, that you can either leave be, and lose a precious ammo, to lie on switches and weigh them down, etc, or you could pick them up, and pocket them. It would be the kind of thing were you would probably only be able to hold 3 shots at most, but if each shot does the equivalent of two bomb blasts, and the balls were easy to retrieve, Hookshot or Boomerang maybe, it would prove a reliable weapon. You could start out with one shot, and from sidequests get more, etc. This also adds the possibilities of cannonballs occuring naturally, for similar use.
The downsides of a powerful, long ranged weapon that limited mobilities would be the following:
Hookshot - ranged stun / retrieve
Boomerang - ranged stun / retrieve
Bow - ranged damage / stun
There isn't much room for one, plus, if it were seen as too "gun-like" many zelda fans would turn up their noses. However, if it were done well, and perhaps if the boomerang were slightly different, like the Whirlwind did in ST, then it could fit. However, the drill also seems non-circuitus, at least in my opinion. It's food for thought, at least, and could accomplish more than just digging and breaking. *Extra* Potentially could shoot bombs... just a thought O.o Use it as a "replacement bombs", and have it launch them...
Cogs: I personally like the idea of either bracers or a belt, belt would probably fit best with a Cog type feel (hint, using a belt in mine too x.x) but the Gauntlet and the Rings mentioned in another thread, plus the bracer idea, would make for an interesting idea.
If you had a glove with sockets or attatchment areas for the cog, you could easily justify them being used as an attack, based on punches and whatnot, etc, but could also be used for certain skills, lock-picking like you mentioned. I don't think they should be tied to abilities, but perhaps could increase them, like the ring thread suggested. I do enjoy your idea of a "Link Hulk Smash"
If the cogs were tied, one at a time, to the bracers, which originally allowed lock-picking, it could feasably allow access to different colored doors. Etc etc etc. I like it, I like it a lot. And I'm trying very hard not to go and write some of these ideas into my own game design book xD
Still: the "Grenade Launcher"? What do you think. I'm on edge about it, it hasn't been done before, and so it's new territory. Plus, it's a gun-esque item, that is a Player Item. It's scary stuff to consider, but it'd end up being really really cool, or just a sour taste =/ Then again, so would the drill, imo.