With the VS lightly clamped you need to center the VS left and right and also align it vertically. To do this you have to unclamp it to move it laterally. Bu if you unclamp the VS then you will loose the vertical position. I made a small spacer block that I could place under the bottom VS hinge bracket to preserve the vertical location eve if I unclamp it. You need to be able to adjust the VS angle left and right while preserving the vertical position. I don’t have a picture of the spacer block but it worked great. I could unclamp the VS and move it left and right without loosing the vertical position.
To assure the VS is vertical, the plans have make equal the distance between the top of the VS and each end of the HS. But what if the HS isn’t level. Well, the HS should be level, but is it? I decided to hang a couple of plum bobs to align the VS vertically. First, I leveled the fuselage by making sure the main wing spar was level, using a bubble level. Then using the plumb bobs align the VS vertical. then measure the distance between the top of the VS and each end of the HS and hope the distances are equal. If they are not then the HS is not level. Mine were within 1/16 of an inch. Good to go in my book.
