First off...my daily driver runs perfect most of the time. Sometimes (and with increasing occurrences in the last month) it stalls at idle. I've been feathering the gas when at idle or even when shifting to keep it from stalling. I was hoping if I drove it enough the problem would just go away but it hasn't...it's happening more often. It usually runs perfect in the morning when the ambient temperatures are cooler. For instance...today I left the house about 8 am and went to the dog park, parked and stayed there for about an hour, then to Home Depot (parked and shopped for about 30 mins), then to Goodwill (parked and shopped for 20ish mins), then to Trader Joes (parked and shopped for about 10 mins), and then drove home. Each time it started right up and caught a good idle and never stalled out. Then this afternoon (around 1pm) I drove to NAPA, Home Depot (again), and Walmart and it would not catch idle on any of the trips...had to feather the gas the entire time. Got home from that trip, parked her and then left about 5:30 pm to the dog park again and it ran perfect again. Leaving the dog park to go home I had to feather the gas again. It's been like this for a while now and it's getting frustrating. Any thoughts on to what the issue may be?
Secondly...in anticipation of having to rebuild the carb (and for practice) I'm rebuilding the carb off of my parts car. In the process I managed to lose the long spring under the discharge weight and the stopper gasket. I was hoping they'd be in the rebuild kit but they're not. Any clue on where I could get these parts besides another carb? Does anyone maybe have these laying around? I'm missing everything in step 8 (a) below except for the weight and the ball. I think the rebuild kit may have a new gasket but without the old one to compare I'm unsure which it is. I also didn't pull the retainer and ball in step 8 (b) below but I sprayed the crap out of it...do I need to pull it?

I also managed to mangle a screw that secures the thermostat casing...same question...know where I could get one or does anyone have an extra?

Another question...the FSM says I need to peen the screws on the choke valve but I have no idea how to peen a screw so I was wondering if I could just use locktite?
Last question (for now

Thanks in advance.