I thought I'd add to this thread as I've made a couple of simple modifications to my watch:
a) Double AR coated sapphire crystal from Takashi
http://forum.replica-watch.info/vb/showthread.php/first-item-offer-double-ar-44639
b) Aligator watchstrap from The_Watchboys
http://cgi.ebay.co.uk/FOR-IWC-Allig...emQQptZLH_DefaultDomain_0?hash=item518e6cadcd
I had initially tried several independent (non-IWC approved) watchsmiths in my local area, to see if anybody would be able to fit a crystal. None of them were prepared to work on my A7750, mainly for fear of making a mistake and causing permanent damage to the watch. I felt there was definite resentment for working on reps, especially as it is so damn good looking and fooled all of them ;-)
So I thought sod them, I can do this, and set about getting myself some watchtools and a crystal press from eBay. Thanks to both Exeekias and Takashi for their excellent advice on crystal fitting. Here's a pictorial run-down...
1) Hont's 3717 double AR - WAY too blue/violet and sharp for me. Time for a change.
2) Caseback easily removed with a lump of blu-tac and a bit of traction. Pull out the crown to its outer position, depress the button next to it, and gently pull out. This process is easily reversed at the end.
3) Unscrew the two screws marked. These are attached to thin metal brackets that wedge the movement into the casing. Magnetic screwdrivers were definitely helpful at this point - potentially very fiddly!
4) Movement removed with some gentle leverage - note the two small metal pillars that connect the chrono buttons to the engagement mechanism in the movement. Easy to put back in at the end.
5) Crystal press - mine was supplied with a variety of nylon fittings, and with a bit of gentle pressure it was easy to remove the old crystal, and insert the new one.
6) Comparison of the two crystals - Takas is obviously the one of the left.
7) Another comparison of the crystals - that bright blue/violet "I'M A REP" tint has gone.
8) The watchface now appears clearer and more black, and as Exeekias noted, the numerals lose their creamy colour and become bright white.
9) Black aligator strap from The_Watchboys - a big improvement on the cheap strap it is supplied with. Looks and feels great.
Having had my 3717 for a few weeks now (which I believe must be a V3), I can confirm the lume is C-R-A-P! This doesn't bother me at all, but for the perfectionists, I can imagine they might want to sort this out. The watch keeps excellent time, and when worn reasonably regularly (eg. for a few hours every other day) it doesn't require winding.
The rattling issue mentioned by some others was only a very minor problem with my 3717, and was easily fixed by tightening the rotor screw. Deconstructing the watch also gave me the opportunity to remove a couple of tiny metal filings that were stuck on the dial, very satisfying to get rid of these!
Although I said this last time, I think I'm genuinely done with modding my watch. It is fantastic, and again I hope this mini-tutorial is useful looking to fit their own crystal.
Cheers,
Kid