Hello Linda McMahon,

The six slots are indeed the way it is done...

The correct tool is called a jaxa...
(don't go TO cheap... they won't hold their ADJUSTMENTS
(back removal: yes cc = loose))..

You can get a good look on both eBay & Amazon (I'll put up pix with URL (links) for your viewing pleasure.

Using AYTHING but a GOOD quality three jaw wrench will guarantee the metal will get damaged... each & every time it is accessed (making future attempts that more difficult).

The key to success with the jaxa wrench is:
- good fit (primary adjustment),
- right bits &
- lots of firm PATIENCE.

First time might take some real force... they seem to employ the Samsonite Gorilla to do the first closure... The notion that these watches can be used for any SCUBA-DIVING... is actually quite fun... but for practical purposes you should treat ALL "water PROOF" watches as water "resistant"... (MY opinion).

Meaning SNUG it good enough when closing.

If you want to get wild... take one of those needle (synthetic clock) oilers... put a dab (not a drop) on some clean paper. Get a clean tooth-pick.. moisten its end and touch around those back threads about where those six slots (you mentioned) show.

If you see any moisture... pick it off with a clean cloth.
That will help gently getting the back to ***** together without messing up the "O" ring seal.

Three tips:
Always clean the watch thoroughly before opening
(old tooth-brush works good)... wipe down with soft clean cloth.

You will also need a jewelers loupe... While BIG magnification numbers sound good initially... working under more than 5x or 10x... will prove to be pretty awkward

Finally... work over a linen napkin... that can catch small screws, batteries or clips that try to fly away when you are working...

OKAY four... a vacuum with an old tee shirt

used as a primary filter CAN (AND HAS) FOUND screws I dropped when I was intellectually challenged enough to work above a carpet...

Okay FIVE... A flash-light shining across the floor will make the tinniest part cast a reasonably good shadow... (really helps).

If you think you can actually handle the iddy biddy things without
popping a couple away... you are sillier than I am... Comment me back... for any other help... (except LOST PARTS).

Good Luck... and Happy HUNTING

Timewheel TWJAXA2 Back Opener Wrench for Large Waterproof Watch Cases With...

Waterproof Watch Case Opener in Wooden Box

watch back case opener jaxa wrench