Mick,

Since you will be passing through Cranbrook, have Ralph put on a set of Talleys (and have them lapped). I tried a pair of the Brno rings (mediums) but they are still too high for the stock design of the 21H, at least for my cheek. If it had a Monte Carlo it would be fine. You will find most older Brno's will have a set of Parker Hale rings attached.