Hello,I have 1980 suz,gs 1100 e,34 mikuni carbs,I need the brass or copper tube that the main jet fits in,suzuki can not get it for me,also known on ebay,or at motorcycle junk yard in my area,also Im re jetting her and it said I must redrill the idle screws,to reveal them so to adjust them,when I tried to adjust them they woudn´t turn,almost stripped,any suggestions?Also if i cant adjust them how do you think she´ll run or idle,Im running 4into 1 kerker,individual air filters,and the highest jet I could get,any help would be greatly appreciated,Thankyou