voskhod rear brake assembly dismantling

[stinkwheel]

As above. My mate Al is trying to get his 1975 Voskhod 175 hybrid ratbike ready for Stormin the castle custom show and we have found we HAVE to use the original back brake and wheel.

Odd to describe, I have never seen a setup like it:

There is a big metal casting bolted to the swingarm that also makes up half of the chain enclosure, the rear sprocket is mounted on this on a bearing and passes through to the cush-drive on the other side. ALSO inside this casting is the rear brake which is a very narrow drum and somehow acts on the sprocket.

When it is on the bike, you see the casting fixed to the swingarm with the sprocket on one side, the cush drive on the other side and the brake lever sticking out through a hole in the side of the casting. The rear wheel just slots onto the cush drive and you push the spindle through the whole lot.

There are no nuts or bolts in evidence, it looks like it is pressed together, I presume we need to put it in the oven until hot then batter it apart with a hammer but it is not obvious which bit to batter (due to many years of immobility) It all turns and the brake works but the bearings are FUBAR.

So anyone seen this setup before? They were also marketed as a Cossack 175.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[ZRX61]

I think you need to re-examine the set up. The sprocket can't be mounted to the chain cover as the chain cover doesn't rotate with the sprocket... unless you are describing a sprocket backing plate maybe?
Is the set up off the bike yet? Can't see why ya can't just pull/push the bearings in/out?

[stinkwheel]