I have improved my skywatcher wedge. Using it on an Astrotrac but as others have said its really naff.
1. Replace the hex bolts with wing bolts for locking down
2. Remove slip washers. I cut two plates out of 1mm stainless sheet. Tin snips work but you could probably do this with garden cutters. Drill 6mm hole and fit in place of the washers.
3. Replace the plastic clamp handle with a spring washer and 10mm nut.
4. Tied a small ring spanner on a string tether to my tripod. That pulls it tight much much better. Also adds some hand space while aligning.
5. Turn knob so above target position. Lower to precise alignment. That stops any backlash in the wedge being an issue.
You shouldn't have to do these simple mods, a company surely can figure this out? However, it now makes a low cost wedge useable for purpose.