Doug,
Welcome to the forum!
I think that is a bit expensive for what you get. I have a copy, bought years ago. But anyway it is only schematic drawings of the lenses not a repair manual in that it tells you how to fix anything. If you have a lot of Takumars and are going to need to work on them, maybe. For one or two, just ask here, there are lots of folks on this forum who have taken a Tak apart.
Do you have a specific lens you need help with? Let me know it might be one I have worked on or someone else probably has.
Also, an internet search for "Takumar repair" will bring up several excellent tutorials. One in particular I remember has step by step photos of fixing a 50mm f/1.4. Having the right tools is perhaps more important than the manual, in some cases it is almost impossible to get the lens apart unless you have the right 'persuader'.
And if you have not found it yet go
here to visit the Takumar Club which is a section of this forum dedicated to Takumars. The folks there are an inexhaustible resource for Takumars.
Best,
John