Have you considered an incorrect handle? Or looking for the same as it was sold? Plenty of old Gillettes kicking around, and you might find a replacement in your local antique shops. There are a few guys that keep a drawer, box, or bucket of of spare parts on hand. As a new member of TSD (Welcome!) you can place a "Want to buy" advertisement -->HERE.
I've actually got a couple of stainless handles to use in place of my cracked ballend handles. Sent from my LGL84VL using Tapatalk
As stated above try to repair it first. If you don't mind the crack showing, plumber adhesive or marine epoxy works well with brass in water based applications.
Glue it and clamp the handle while it dries. If that ball end and collar are loose might as well glue them also. Don't even worry about the excess. It is easy enough to remove afterwards. If the ends are loose glue or epoxy it from the inside of the handle first then glue the collar/ball end back on afterwards. That handle will be good for another 50+ years once it dries and fully cures.
If you don't want to glue it, iKon made some stainless tuckaway handles a few years ago. I have one for my travel kit and it is pretty nice. I just use a bulldog handle at home as I like the additional weight and length. The handles are out of stock at ikon, but they are available online. Connaught has them as does amazon. https://www.ikonrazors.com/shop/ikon-handles/ikon-tuckaway-handle/
For an adhesive use loctite plumber and marine adhesive. You can buy it at Walmart or any hardware/home improvement store. If you use a 2 part epoxy make sure it is for plumber or marine. The adhesive sets clear. Last handle I repaired I used a toothpick to apply the glue on and into the crack then you use a c clamp and tighten perpendicular to the crack and let it set. That is it. Remove c clamp and any excess glue after it has fully set and before it fully cures.
You will see the crack like before but it will be stabilized and won't spread. The adhesive I am pretty sure has a higher shear strength than the brass itself. If you want to cover it up you are going to have to solder and then replate the handle. It is more trouble than it is worth, lot cheaper to buy another handle then if you want to go that route.
As I stated before I endorse repairing as first choice. I like to fully disassemble, ruff up inside, and inside ends with fine sand paper (to aid in adhesion); then reassemble using 5 minute epoxy and clamping with hose clamps (lightly).Protect the tube with electrical tape, but leave only crack exposed so as to see crack closure. Make sure to keep threaded end up to keep them clear of epoxy. Even if you can't make the crack totally disappear, it will be rock solid.
iKon makes a SS handle modeled after the original tuckaway one. Sent from my Nokia 6.1 using Tapatalk
i repaired my new improved tuckaway handle with marine epoxy.. took the handle apart and scuffed the surfaces, applied the epoxy ,assembled handle. 1 wrap of blue painters tape and clamped it with an M-6 hose clamp over the cracked area..not too tight.. ..barely see the crack and very secure..