Aye George,
Thanks for the heads up, but non-desmo head is quite sufficient for my bimblings!
If you haven't the skill/wherewithall engineering wise, it'll no be cheap to sort.

And I definitely fit the latter category. With the current 350 barrel muff/liner debacle setting me back the best part of £800, I'm in no rush to buy another bit of "scrap".
Good health, BillR