Tekno,
Are you guys in the office? I've tried emailing twice over the last two weeks on this and not received a response. Normally it's been real quick, so I'm wondering what's up.
I'm not sure we received an email from you. Did you send it to info@teknorc.com? I don't think we've received any packages from you for us to look at a possible defect. I'm still thinking that Neu has changed their spec and it may not be compatible with the 40mm mount. You can try the 42mm mount, but be sure to put a little support inside to take up the slack (tape, velcro, something firm that won't mark the surface)