I have two eyepieces purchased from Sylvain and don't have any problem with them.
Very happy with them in fact.
I noticed on the Coudy Nights forum, a number of people making remarks like
"once you fix the dreaded rattle, everything is good".
I had to ask just what this rattle was and how to fix it.
Here is the thread if of interest....
http://www.cloudynights.com/ubbthrea...vc=1&PHPSESSID=
Michael