moving it in and out is only the equivalent of pushing the lever back and forwards, i had a lot of problems lining up the linkage on my 2ltr 16v nova F16 box
to select the first row e.g. 1st and 2nd the selector arm needs to be twisted slightly on the f16 box you twist the linkage till a 6.5mm drill bit drops into the hole on top this then lines the linkage up for 3/4th so when the bolt is tightened and the drill bit removed it springs back slightly towards 1/2nd
hope this helps if not try poncing a good old haynes manual off someone which will probably explain it a lot better
Slider is right but somtimes you are lucky and its done in 10 mins and I have once spend a few hours playing around to get it right.
Just look onto top of the F28 and there is a small Black Bung which you pull out and stick the drill bit down. You will need to move it around a bit until it locks up. Once thats done remove the gear lever gator and you will see a small hole on the stick and one on the casing on the left side. Move it over and stick another drill bit in there to lock that up. Then tighten the linkage and you should be near enough there. You may just need to loosen of the linkage and move the lever over a little more.