Hello, I've fitted one of the above to my no 4.

To my dismay I've discovered that I've no adjustment for elevation. Turning the lead screw does nothing. The windage works ok though.

Trying to get this thing adjusted to zero is a right b******! although surprisingly I did actually manage to zero it as the elevation didn't need adjusting.

I've also noticed that the drums tend to lock up and won't turn their full range of movement when the lock rings are tightened.

I'm just looking for help and advice and if anyone has experienced similar probs with these repros and if its easily remedied !!!! I fear not.

In anticipation.
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