With a 1927 Scott Super Squirrel I purchased at auction came a curved T shaped bit of hardboard. The top of the T is about 85mm across. The length is about 300mm long. On the back is written SCOTT SQUIRREL. On the front it has lines across and starts on the bottom with 1/4 going up 1/2, 3/4, 1, 1-1/4, 1-1/2, 1-3/4, 2, 2-1/4, with 2-1/2 at the top.
Can anybody tell me what it is for? I can e-mail a photo, but as yet do not have the skill to put the photo on the forum.