Question About Making A New Suspension Spring

[Dave D]

I am working on this New Haven Whitney banjo clock and it has no suspension rod. I see several thicknesses available in the repair catalogs, but I don't know which one to get. Is there a good middle of the road thickness to get or is this something that is critical? I appreicate all the great advice I get here.
Dave D

 

[Willie X]

.003" is good. Willie X

 

[Dave D]

.003" is good. Willie X

Thank you!
Dave