No installation problems after a little sharpening.

The surface treatment of the slide valve seems a little rough, the OEM was the same, so no problem.
Because the negative pressure presses the Slide surface Rear against the sidewalls, especially the areas that are strongly hit are polished and shining.
If the corners and flat surfaces of the PAL blade wings are polished with a gold-based polishing compound and installed, the initial sliding will be smooth.

Tidak ada masalah pemasangan setelah sedikit diasah.

Perawatan permukaan katup geser tampak agak kasar, OEMnya sama, jadi tidak masalah.
Karena tekanan negatif menekan permukaan Geser Belakang ke dinding samping, terutama area yang terkena benturan keras yang dipoles dan mengkilat.
Jika sudut dan permukaan datar sayap pisau PAL dipoles dengan senyawa pemoles berbahan dasar emas dan dipasang, maka geseran awal akan mulus.