I have a Merkur Progress I bought awhile back, but was wondering, this question I have probably has already been asked before but can't seem to find the thread: when I put a blade in (also without a blade in the razor) and tighten it down all the way close to "1" as it will go, blade gap is fine, head doesn't rock back and forth. As soon as I dial up the razor past about "2", the bottom part of the razor head, (the part that has the triangle engraved on it) rocks back and forth, causing the top part of the razor head plate to have uneven blade gaps from one end of the razor to the other. Basically the razor head assembly doesn't hold firm anymore as soon as you dial up the razor from it's lowest setting. If you push down on the head or lightly press it, one end pops up higher than the other on the razor head. How do you fix this, or is there a way around this problem?