Vintage Canvas, congratulations on your rifle and on the superb restoration work that you did; I am sure a skilled professional would not have achieved a better result! By the way, I saw your M. 1903 was a 'Made in Austria' one, so post-WW1, but in which year was it manufactured?
I was also faced some years ago to a broken spring on a take-down pin; this is a common problem often encountered by MS addicts! I had the broken spring replaced in Austria; as above mentioned by Waidmannsheil it cost me an arm and a leg but the pin was professionally fixed, which was the result to achieve.
Louis