Hi Rob,
Your observation that the forend moves away from the barrels might be the answer. I don't know what the Flues' parts look like but many doubles use the forend iron to operate the cocking mechanism. You might need to add metal, by peening, to the forend iron slot where the barrel lug goes through it, to get the forend iron back snug-but-free agains the front of the receiver. This may be where you are losing the cocking drive. JL

> Jim Legg <