Hook for mini gantry for 20x20 aluminum extrusion x-axis conversion

There is a great x-axis conversion for 20x20 aluminum extrusion
https://www.thingiverse.com/thing:1285301

I did a remix for it for my tronxy p802ma printer
https://www.thingiverse.com/thing:2766399

However, the conversion requires using 20 tooth pulley and idler, otherwise the belt is not parallel to the axis.

To understand: with 16 tooth pulley/idler the problem is not visible in the center of a bed because error is only 0.006mm. However, close to the edge the error becomes as large