I recall watching a program on the restoration of a 109(g) could be wrong on exact model but the restorers were talking about the DB and said to be very careful with the crank as they cant be reproduced.
Not sure why that is they never said and I would think with todays tech a 1940's crank would be no problem.
One of those things that make you wonder...... never found out if it's true or the reason why they cant be made today.
The was an episode from Wings of the Luftwaffe from the early 90's.
The 109 they showed was a G-6 base (probably a Spanish Ha-1112 from the Battle of Britain movie) but with a facsimile 109E cowling, spinner, clipped wing tips, horizontal tail struts, and dummy cannon barrels in the wings. The plane is the one on display at the Seattle Museum of Flight.
Not sure is there is an actual DB 601 in there, but I doubt it given how hacked together the rest of the plane is.
The comment regarding the engine crank of the DB engines was made made by a tech at a museum in the U.K. - probably Duxford.