Using the horizontal gap tool "set tool" (T-2064), align the encoder bracket to the scale (see figure) by pinching the tool between the encoder bracket and linear scale and slowly tightening the encoder bracket mounting screws by alternating between screws to prevent shifting the bracket.
Be sure alignment is not made where there are labels on the scale. Leave the "set tool" in place and check that the bracket surface and the scale surface are parallel. If they are not, use a feeler gauge to measure how out of parallel they are. If they are more than .004" out of parallel shim the encoder bracket.
Remove the "set tool" and verify allowable gapping error by inserting the "go tool" (T-2063) from both sides of the bracket. Insertion of this tool means the gap is not too small.
Attempt to insert "no go tool" (T-2065) from both sides of the bracket.
If the tool does not fit then the gap is not too large.
This completes alignment of the encoder bracket.
Note: For VF 3-5 machines the gap tool cannot be inserted from the far side.