[Nonameman]

To remove attached object, you have to use the RemovePlayerAttachedObject() function, calling again SetPlayerAttachedObject() won't work.

pawn Код:

if (strcmp(cmd, "/helmet", true) == 0) {
    if (IsPlayerAttachedObjectSlotUsed(playerid, 3))
        RemovePlayerAttachedObject(playerid, 3);
    else
        SetPlayerAttachedObject(playerid, 3, 18645, 2, 0.07, 0.017, 0, 88, 75, 0);
    return 1;
}