Chainsaw Repair

I made some progress tonight.

I pulled the decomp valve off my 345 and it fit in the 357 nicely.  I plugged the hole in the hose temporarily and tried it. Note that i didn't plug it at the bottom, so it's possible that the hose has a leak.  What should i use to plug that hole permanently? 

The saw starts with the choke on.  Once the choke is off, the saw starts again, revs up and dies.  I tried changing the idle speed screw and low speed screw in multiple positions, with no luck.  Same symptoms, but different start up speed. 

I then put it back on the work bench and started tinkering again.  I found the fuel line from the carb to tank is very **** and leaking.  So, how do i go about replacing it?  Do i have to pull the tank?  Should i replace the other line while i am in there?  That one looks more difficult to access.

I pulled the carb.  It looks pretty clean.  I may disasemble it and clean it.  Should I?  Do they make a carb rebuild kit for this carb? 

Another problem is that the fuel tank leaks.  The saw has the older style fuel cap, which i like better than the new.  Do they sell the o-ring for this? 

Also, the saw has the older style (i think) limiters on the carb adjustments.  There is a one piece cap that covers both screws.  What is the best way to remove the limiters on this saw?

The clamp at the cylinder is plastic as mentioned.  I don't know if there is a leak yet. 

I have a few dealers nearby, but i've never visited them.  Do dealers typically carry parts like this (decomp valve, fuel hose, filter, etc)? 

Thanks again. 

Jon