Sheap. You must first align the finder mount up to the centre of your t'scope tube, with the finder 'just loosely' held in the centre. In other words, centre the finder in the holder/mount & then align. If cannot get anywhere near centre, move the mount so you can. The finder should have approx. equal spacing,(give or take a tad), to the inside of the mount.
Recollimate outside.
When centred, just 'nip' the adjusting screws. Do not overtighten.
HTH....
L.