The original templates used to align tape recorder heads are rare and expensive these days.
Of course, for profesional services, gauges machined in metal are much more accurate than any print.
This one is a replacement suitable for the initial setup of the tape recorder in amateur conditions.
Size references can be found here:
https://forum.stereo-hifi.com/topic/2186-forum-service-tape-forumowa-kaseta-serwisowa-tylko-dla-aktywnych/page/12/?tab=comments#comment-50822
and more pictures of original gauges including instructables here:
http://audiohobby.pl/index.php?topic=13574.15
Those are Polish sites - please use translator if needed.
This is a remix based on the model posted by DrLithium in the:
http://forum.vegalab.ru/showthread.php?t=41458&page=4
Russian site - please use translator if needed.
Printed with prusament PLA,
The author hasn't provided the model origin yet.