When you extend the barrel of your Summitar all the way, all the way being the operative word, it locks by twisting it to the right/clockwise. As Kieth said there will be no click to indicate a lock up. Again as Keith said the slight mis alignment of the focus mark is not a big deal. For the stiff aperture ring refer to this thread http://www.rangefinderforum.com/foru...light=summitar
. Following the instruction given in it I was able to solve the problem of the stiff apereture ring on my Summitar. Before the fix it was so stiff that you turned the whole lens barrel in an effort to change aperetures. It is now butter smooth.