Chainsaw Repair

Hi Guys,
I recently created a topic about my 390 not oiling the chain, I thought I had it fixed - but no.
The problem eventually turned out to be the feed pipe with a hole in it, hence the air bubbles I was concerned about mentioned in the topic.

However, I now have a much more serious problem, after obtaining a new pump and feed pipe, I disassembled the fly wheel etc to get at the old pump,  I dont have the special Stihl locking thingy that goes down the spark plug hole so I used the method mentioned of pushing line into the plug hole until it locks   -   and yes it did, this appeared to work fine, it even kept it locked when I torque'd the flywheel back on again.   
Then I had a problem getting the all of line back out of the hole, I pulled about 3-4 feet out and it locked up, I gave it a sharp tug and it 'snapped' I managed to find another end and pull more out till it stuck again,  (I didnt think of turning the crank at that point !!!)  I thought I had it all out so continued re-assembling the 390, then when I tried to start it, it seized up tight.    So took out the plug and looked in the hole and saw a bit more line !! (about a half inch), I took off the flywheel and hand turned the crank, I believe !!! I now have all the line out as I can move the piston up and down at will, it pulls fine on the pull cord too  -   BUT it will not start   -   I am wondering if I have damaged the decompressor or a valve  -

Any suggestions
Cheers   John

   Plug's OK, it wasn't in at the time.  It is difficult with this m/c to check the spark too, I will see what I can cobble up to see if it is sparking.
cheers

But then again, the bit of line left in may have closed up the gap, so thanks, I'll check that.