Ok CTC-5er's - More advice needed!

[Ralph S]

Thanks for your comments on the startup procedure for the CTC-5. Everything went just fine and I've got picture! But I really want to get the HV on the mark before heading in any other direction. Right now I'm getting between 18 and 19kv, but I'm only making it to 500 microamps in black! With other sets I'm used to 800 to 1000. The core of L106 (the Horz. tuning coil) is stuck and I don't want to force it. Any ideas on how to get it to free up and further, is it worth pursuing this?
The final complication at this point is how to pop fuse F104 out of its holder to measure the Horz. oscillator current. Frankly I've never seen a fuse holder like this one before. What's the trick?