G'day Sticheroo (Ron),
Thanks for your thoughts. I've been a bit busy of late so I haven't progressed anymore than my last update. I did check the timing, but didn't adjust anything as all was well.
The thread shredding problem has also disappeared as previously indicated. Thanks again to everybody who have helped out with their comments.
On the unrelated issue of Guns in Australia if you want a rundown on the situation here send me a private message with your e-mail addy and I'll respond. In a nutshell Semi-Auto's are banned (1997) but everything else is OK.......for the time being.