This issue was also covered by another iceinspace user, serge in 2005, although he hasn't posted since Jan 07.
Have a look here:
http://www.iceinspace.com.au/forum/s...ead.php?t=4369
serge used similar bearings with bigger OD and bored out the worm shell housing to suit the bearings OD. Sweet.
This is an issue I'll be looking at on my EQ5.
edit:
Martin maybe we can compare musings..I"m in Lilydale just a hop skip and jump down the road.