i am talking about this hadith;
Tabarani, in his "al-Mu'jam al saghir", reports a hadith from 'Uthman ibn Hunayf that a man repeatedly visited Uthman ibn Affan (Allah be pleased with him) concerning something he needed, but Uthman paid no attention to him or his need. The man met Ibn Hunayf and complained to him about the matter - this being after the death (wisal) of the Prophet (Allah bless him and give him peace) and after the caliphates of Abu Bakr and Umar - so Uthman ibn Hunayf, who was one of the Companions who collected hadiths and was learned in the religion of Allah, said: "Go to the place of ablution and perform ablution (wudu), then come to the mosque, perform two rak'as of prayer therein, and say:
'O Allah, I ask You and turn to You through our Prophet Muhammad, the Prophet of mercy; O Muhammad (Ya Muhammad), I turn through you to my Lord, that He may fulfill my need,' and mention your need. Then come so that I can go with you [to the caliph Uthman]." So the man left and did as he had been told, then went to the door of Uthman ibn Affan (Allah be pleased with him), and the doorman came, took him by the hand, brought him to Uthman ibn Affan, and seated him next to him on a cushion. 'Uthman asked, "What do you need?" and the man mentioned what he wanted, and Uthman accomplished it for him, then he said, "I hadn't remembered your need until just now," adding, "Whenever you need something, just mention it." Then, the man departed, met Uthman ibn Hunayf, and said to him, "May Allah reward you! He didn't see to my need or pay any attention to me until you spoke with him." Uthman ibn Hunayf replied, "By Allah, I didn't speak to him, but I have seen a blind man come to the Messenger of Allah (Allah bless him and give him peace) and complain to him of the loss of his eyesight. The Prophet (Allah bless him and give him peace) said, "Can you not bear it?' and the man replied, 'O Messenger of Allah, I do not have anyone to lead me around, and it is a great hardship for me.' The Prophet (Allah bless him and grant him peace) told him, 'Go to the place of ablution and perform ablution (wudu), then pray two rak'as of prayer and make the supplications.'" Ibn Hunayf went on, "By Allah, we didn't part company or speak long before the man returned to us as if nothing had ever been wrong with him."
'The account has been classified as authenticated (SAHIH) by Baihaqi, Mundhiri, and Haythami."
as for response to the hadith of blind man , the man first sought du’a from the Prophet(peace be upon him) then the Prophet (peace be upon him) commanded him to supplicate himself for himself seeking a means through the Prophet(peace be upon him)..then If the intent in tawassul here was seeking du’a from the Prophet(peace be upon him) the Messenger of Allah (peace be upon him) would have supplicated for him and the matter would have ended but he (peace be upon him) taught him the method of du’a for himself for the future and taught him thereby to seek a means through his essence.
No one calling to dead when he says, “O Allah I seek a means to You through a certain servant of Yours”, and he does not mean by that anything besides, “I love that servant and I believe in his virtue and righteousness, and perhaps he is beloved to You, so I seek to draw Your mercy through my relationship or love with him”. This in reality is seeking to draw the mercy of Allah Most High through one’s relationship with a pious man and his love for him. This includes the living and the dead.
Thus, if a man were to abbreviate his statement and say: “O Allah! Indeed I take a means to You through the Prophet” and does not intend thereby anything besides this meaning mentioned which is from the most obvious meanings of tawassul, then there is nothing in the Quran and Sunnah or the principles established through them that prohibits this form of tawassul. Rather it is more deserving of being permissibile than tawaassul through other good deeds, because one who seeks a means by his prayer, fasting or charity, it may be tainted by the blemish of vanity in his good deed. As for one who seeks a means through his love for the Prophet (Allah bless him and grant him peace) or through the love of his Companions (Allah be pleased with them), for example, this is closer to humility, as it is akin to saying: “I do not have an action good enough for me to seek nearness to You by means of it, but I love these brought close [to You], and by the means of this love I seek Your help and I seek to draw Your mercy.”
This is How abbas (Ra) prayed himself , lets see
He (Ra) prayed in these words to Allah
اللهم إنه لم ينزل بلاء إلا بذنب , ولم يكشف إلا بتوبة , وقد توجه القوم بي إليك لمكاني من نبيك
O Allah,calamity (and trouble) comes as a result of sin and only penitence lifts this calamity, and the people,because of my relation with Your Prophet (صلى الله عليه وآله وسلم), have offered me to You as a means of seeking Your help, and these hands of ours, besmeared in sins, are before You and our foreheads are bowed down with penitence. So give us rain
Ibn Hajar ‘Asqalānī narrated it in Fath-ul-bārī (2:497)
Subkī, Shifā’-us-siqām fī ziyārat khayr-il-anām (p.128)
Qastallānī, al-Mawāhib-ul-laduniyyah (4:277)
Zurqānī in his Commentary (11:152)