Hi Russell,
I have exactly the same scope as you and yes its a bit tight getting past the vanes but my hands just get through.
I was having trounle centering the mirror and the collimating until i did the whole astrobabys directions with the paper etc.
I had to take my secondary off to fit the dew heater properly and while it was off i gave it a well needed clean.
When i put it back on i couldnt quite get it right.
The laser would say its right but the there was plenty of coma towards one side.
With help from other members I've finally got it !!!!.
http://www.iceinspace.com.au/forum/s...d.php?t=176181
I also did the plastic milk carton washers at the same time.
Try chopsticks and blue tak to get the white card in the tube just to hold it in place.
I've got two lasers and film canisters but until i got my Cheshire type tube I was still having trouble.
https://www.bintel.com.au/product/or...v=6cc98ba2045f
Hope you have a less frustrating time than i had.
Cheers
Andy