The original butt probably split, a common problem on the Mk2 butt which is why the Mk3 butt was introduced (The only difference being the actual butt plate, not the wood). But this didn't solve the whole issue and they still split. If any part was unservicable it would have been replaced with another part and as the Mk2 and 3 butt became obsolecent, the Mk4 butt would have replaced it. I think I may have a Mk2 or 3 butt somewhere if you are happy to pay postage, it will probably need some attension like oiling and cleaning but I'm sure it would be ok.
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