Difficult install - Strike Industries Mini King Compensator

This should be shipped either with a selection of shims, or a locking nut. The supplied crush washer is really pointless. I would have had to turn an additional almost 3/4 of a turn after initial contact with the crush washer. I don't believe it had that much "crush" in it or without potential damage somewhere else in the gun (such as need for an excessive grip on the barrel to possibly cause damage. I ended up having to take it to a gun shop and pay an extra $35 to have the install "timed". A small selection of shims or a lock nut I think would have solved this issue. I read a review that said these used to ship with a lock nut...if true, why did they stop this???