Lens broke into 2 pieces - 1 the bayonet connector, 2 - the optics. 1 flex between both parts was cut, 3 holding places in the 1st part were broken which hold part 1 to 2.

Yes, you can order replacement parts at there website.

http://krupsonlinestore.com/product_list.asp?SKW=krugrind&MENU=grinders&trk_src_ss=KRUFGS75WEBPAYPC%7CPPC%7CADW%7Ckrups+GVX1+coffee+grinder&.

Well, here are some facts about glass lenses that might help you reach a better decision.Glass is the only lens material that can be made into 100% optically correct sunglasses. For true vision, there is no comparison between glass and other lens materials.
Glass does not flex or compress. Whenever lenses are placed into an eyewear frame, they are held in place by pressure of some kind. Plastic lenses flex and that creates distortion; but that cannot happen with glass lenses.
Glass does not expand or contract in heat and cold in a significant way. No matter what the temperature outside, 100% optically correct sunglasses will remain 100% optically correct.
Glass is the hardest material, and the most scratch-resistant. Glass is the most durable, and longest-lasting sunglass lens material. However, it is not scratch proof. Sand can scratch glass, but it requires serious effort or trauma to scratch glass lenses.
Technology has made it possible to create a very lightweight glass lens. Today, it can be difficult to tell the difference between glass and plastic, even when holding a pair with glass lenses in one hand and a pair with plastic in the other hand. (Of course, the difference is clear when looking through the lenses. But the weight of the lens is no longer a dead giveaway as to which is which.)

The danger of shattering was once one of the major disadvantages of glass lenses. However, all glass lenses pass the "Drop Ball Test" for impact resistance - the same test that is administered to polycarbonate and CR-39 lenses. When today's polarized lenses tend to break in a similar pattern as a car windshield. The broken pieces of glass mostly stick to the polarizing film that is inside the lens.
These Spotters had been stepped on by the customer. Notice that the broken lens has retained its original curvature. The broken lens pieces were still so tightly held by the frame that we had to smash the broken lens out of the frame with a hammer (it took more than a few smacks, too!). This isn't to say in any way that glass lenses are equivalent to safety glasses. However, polarized glass lenses are much, much less likely to cause injuries today than they ever have been in the past.

They aren't too hard to open up and take apart. There's a glass piece the covers the actual lens and I'm guessing that is what broke. Once the flip is in pieces you can remove the glass piece and it will operate fine without it. If you want to replace it, you can either get a broken flip and use it for parts, but there's a pretty sticky, tough ring of tape holding that glass piece in place. You could also try a very clear piece of plexiglass and cut it to size. Haven't tried that one myself, but it may work.

This might help.
Look down the left margin for the lens you need guidance on.

http://www.leitax.com/leica-lens-for-nikon-cameras.html

i would do a tack together job on it,,
get some thick fuse wire and tiy it round inside the grill holes on the out side edge tiy each one together at about every inch apart around the grill that will hold the two grill's tight, then if you still have the broken plastic bits glue them back on using supper glue its cheeper that trying to get part that you may never find?

Part # 1C999-601-2 was the number Nikon said the part was called. It was used to replace the broken bayonet mount unit as seen in this step-by-step repair:

http://www.gmtruckhq.com/artwork-design-forum/how-fix-broken-nikon-dslr-lens-mounts-3271.html#post125961

I have the same problem - the plastic bayonet lugs are the weak point on the lens assembly, but better that then breaking the camera body mating ring. I've dissasembled the rear of the lens and will try to reglue the two split lugs with cyanoacrylate glue. Be very careful not to mix up the 3 different types of screws, avoid damage to the multi-contact plate ribbon cable, and to not to loose the backfocus shims! Cheers.

I feel for you. exactly the same happened to me but i was looking to upgrade lens so i used it as an excuse.the piece is called a bayonet. what lens is it, is it the kit lens. my lens was unfixable so  am afraid as the mount is plastic the whole lens is a right off, if it was a metal mount it would be worth fixing. sorry

If the spring did not damage the carriage flex I would suggest just using some epoxy to hold the spring properly in place. If the spring did damage the flex (as shown in this picture) then you might contact HP and enquire about an extended warranty for this issue. In the US call HP at 1-800-HPINVENt.

Regards,
Bob Headrick, MS MVP Printing/Imaging

you could try GOOP adhesive