1) Anyone using shims on steering spindles to reduce the up and down movement where they are fixed to main spindle carrier?

2) Also anyone using shims on main spindle carriers to reduce the movement of back and forth,where they are fixed to front a arms

If so where would the ideal spot for shim to be placed
For 1) shim top or bottom of steering spindle? To slightly push front wheel up or down?

For 2 ) shim back or front of main spindle carrier in between a arm? To slightly push front wheel fwd or back

What would be better for shim placement for these examples?