USCZachD thanks man for the idea will try that in my next session.
i got to use the sling shot and it is very kewl man.
here is what i did
200x5 , 230x5, 260x5 couldn't get more than 5 on the max rep set. so my friend said lets do 5% increase and do 5 reps again like a joker set.
bumped it to 275 and got 5 reps easy so i just did 2 sets with the 275 for 5 reps and that was it.work hard on the last rep to lock it out.i do have a lock ut weakness so it could help.
did db incl rows with 80's for 3x10 some curls and called it a day.