King Craft KZW230B Angle Grinder: Seeking Wiring Diagram for Damaged Switch Replacement

Hello
Occasionally, I bought a King Craft KZW 230B grinder, in which the previous owner, instead of a damaged switch, tried to put on an ordinary, rocking, unipolar one and so successfully dismantled the electrician that nowadays it is not possible to get any better. I tried to find a wiring diagram but somehow I can not find the above on the internet.
Maybe someone has such a scheme or knows where to find it or is able to draw a handwritten connection pattern for me? I would be extremely grateful.

Please correct the title. Where there should be uppercase letters, please write them. [retrofood]

Four wires come out of the stator. We choose one wire and connect to the nearest brush-holder. We take the second wire diagonally from the previously chosen first wire and connect to the second brush holder. The remaining two free wires are connected to the power supply (via the switch). If after assembling it turns out that the rotor is rotating in the wrong direction, the wires connected to the brush holders should be replaced.

PS. Do you have a mild start up there?

I did not have much time to go to repair this grinder. I have just mobilized today and ... it turns out that the grinder has some electronics in it. Plastic inscription on the plastic housing; ERST-16A16 (10) 230V 5E4 and below wiring diagram. In the middle, some parts, among others, LM 358, transistors S9015 and S9014. The aluminum cover is attached to the BTA 12 / 600B triac, which should be soldered to the plate, but someone peeked in and snatched it with the aluminum cover. I tried to take out the electronics board but I could not do it because it's glued to the casing ....... and maybe someone knows how to peel it and not break it. How much can it cost new and where you can possibly buy it, although I'd rather fix what it is.
I attach some photos

This tile is only a mild start, it costs 25zl on the Allegro.
This gentle start you can not fix it, it seems to me that not only this triac is detached but the electronics are burnt. Give it to yourself and connect directly under both cables coming out of the stator just like your friend Tomek presented above.

I have Kling Craft model KZW 230 and I am looking for a gearing. Please, answer here andres andreso92(_at_)o2.pl

Somehow it happened that I forgot to close the topic.
According to the suggestion, I did not combine to play in the repair of a soft start, I only bought a new one / 19 PLN / and I put it on a grinder.
After the repair, "hula" grinder that it's nice! I have found that it is very specific, strong and durable equipment and the relation quality / price is very beneficial.
Thanks for the advice - I am looking at the topic.