Prusa - PTFE bearing X-carriage

I Had a problem when using a PLA bushing for my new prusa x-carriage, i found that a PLA bushing seem no good to holding on a X Axis Rod and make it less gap btw them. So, i redegin a whole x-carriage by using a PTFE as a bearing and I also using a two side screw tensioner fit onto x-carriage, it works very fine for me to tightened X axis belt just by (un-tightened 2nos M3 belt clamps screw + turning screw tensioner as you want how x belt to be tighten).

However, I notice that this design may