Congrats on the buy! (I think I was just watching that on eBay ;o) ha.)
I can mount mine in two ways, shown in the 3 photos here:
http://imgur.com/a/3EAOy
Your small rear ring is 24mm, so what ever you do you need to be able to connect 24mm to your main lens.
OPTION ONE: Clamp kit. http://www.ebay.com/itm/ANAMORPHIC-LENS-CLAMP-KIT-KOWA-SANKOR-SINGER-ISCO-/300569782054?pt=Camera_Lenses&hash=item45fb5ae726
This you can see in photo one and is the option I most use (because of the issue below (otherwise I'd use option 2)). You need the right step up rings to connect. This example is a 40mm Canon lens with a 52mm thread, and it works super easily. Now, because the rear ring on the Bolex is 24mm (quite small); you will most likely need a step up ring like mine (24-37) to attach here.
OPTION TWO: Step up rings only. See photos 2 & 3. I use a 24mm to 37mm step up ring. If you look at photos 2 and 3 you'll see a 50mm Canon lens with a 58mm thread. You can also see a 58mm - 37mm step down ring which connects this lens to the bolex. Now there is a downside to this method which is that I can't quite "twist" the bolex all the way into the 58-37 so that its perfectly aligned because the threading "stops". I use an elastic band between the rings to help here. If anyone else can help with this, I'd appreciate the input. In other words: if you look at photo 1, you can see a white line. This white line must be properly aligned with the top of the camera, unlike a normal spherical lens where you can just pop it in. So that's why option 1 works best.
My explanations above are a little convoluted but it's all super-simple though. Good luck.