I recently acquired an 18s Rockford with serial #766919.. Looks like it is a grade 930 model #9. It needs a mainspring. Is there more than one part number for this mainspring? Or is it one 18s Rockford mainspring fits all?.. Thnks for any info..

One size fits all 18S Rockfords...

Factory # 644
Bestfit # JA-550

Specifications:

Dennison Width: 20
Dennison Strength: 2
Length 22 inches

Metric width: 2.9mm
Metric Strength: .22

T End

I've had a hard time getting any Rockford springs from S LaRose, but Jules Borel has them.

Mike Miller

Mike,

Thanks for the info!!

Bruce