Empire
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As requested, pictures from my conversion.
-CAVEAT: This is a sloppy job, I just had an adapter handy and a modest amount of initiative. I will probably Re-do this at some point but for now it is fine. Absolutely no play in the mount. Furthest focus is ~7.5m. I need to adjust the focus stops.
Removing the mount. That screw hole near my thumb - there is no need to take that screw out. It is the stop for the breech lock mount. if you take it out you canseparate the siler part by unscrewing it CLOCKWISE. This may be handy for making your drill markings on the new mount .
This is the inside of the mount. lots of nice little ballbearings in THERE aint it?
This is the mounting boss. Only 3 screw holes as you can see.
Bad idea. I really miss that litle ballbearing already 
As a substitute for using the A/M switch to stop down, a slice of body cap could be made to fit in behind the stopdown lever here. No more need for A/M ring then, although I would prefer to be able to switch between wide open for focussing and f8 for shooting without having to look at the lens...
Bar-clamps. a few dollars and bloody useful.
Here they are put to use holding the m42 adapter in place while i mark the 12 o'clock position and relative screw positions on it. As somebody elses noted, the screw holes fall inbetween the bayonet teeth, making for easy drilling.
rudimentary way of plotting drilling points for screw holes
A joyous result. this was placed on the back of the adapter and centered by eye and then the two were clamped together. I then used a leather punch to make small marks where i needed to drill)
drilling setup. I found this to work quite well.
When drilling, I first made wide cuts into the side of the adapter and slightly then turned it over and using a small bit made the actual screw holes. These required some widening to allow for inaccurate measurement.
The frankenstein result. I found that two of the screws required a slight trim to allow smooth mounting. It was extremely tight before this. In regards to the considerable amount of scratches, I recommend you use wiether a grinding bit or a dremmel to make the recesses. I used a drill bit and it shows 
The gab between adapter throat and rear element retaining ring is tiny. This helped in getting my screw holes aligned accurately (sort of  )
Lastly, once you have converted this lens you will need to be very careful of the rear element. the retaining ring does not extend to the edge of the glass so if you put the lens down on its bum, make sure you wind the focus in to about 1.5m or so to avaoid damage.
Here you can see the gap between the AM ring and the mount. Did somebody say that a body cap or lens cap is the perfect thing to fashion a spacer out of for this?
There is obviously quite a bit of play but i think not quite enough for that ballbearing to come out.
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