Hi Harry, welcome. what you have sounds interesting.

A picture really would help in getting you some answers. Does the mark pass across (bridge) the joint, or does it appear on both timbers?

Pics are pretty straightforward to post here. Try these instructions: (you need to create an account at a free hosting site)

To post pics here via a free hosting site such as photobucket:

· Go to http://www.photobucket.com and create an account.
· In the "upload images & video" section, click "choose files" (640X480 is a good setting, anything bigger will have a negative affect on pages in this forum).
· Choose your picture.
· It will upload and you can title it if you want.
· Click "Return to album" (your picture is now on the photobucket site).
· You will be redirected to the uploaded photo; move the cursor over the picture.
· Click "direct link" then right-click "copy." (A link to the photo is now on your machine's clipboard.)
· Go back to the TFG forum site. Click "reply"
· On the top of the reply text window, click the icon third from left (next to the envelope).
· A small window will appear with "http://" highlighted
· Right-click in this window, select paste (which will insert a link to your picture from photobucket), click " OK."
· Select "preview post." You should be able to see the picture that will appear instead of just a web address. Just type text above or below the web address.

Looking forward to seeing your pictures.