Lyle started using 3x3 node spacing around 1940
For sale here is a spare spool for a Hardy Princess
The truncated Swiss-style ferrules are size 9/64 and 15/64 with a perfect fit
For sale here is a Sage Model 707 fly reel and spare spool in near mint condition
presumably original but I can't be certain
Kirkfield, Stuart - "The Fine Bamboo Fly Rod" 7'10" Lyle started using 3x3 nodeStackpole, Harrisburg, PA, 1986. Hardcover. Book Condition: Like new. Dust Jacket Condition: Fine. 1st Edition. Two tone cloth with gilt spine titles; 8vo; 192pp; illustrated with b w photos. color photographic dust jacket. With chapters on assessing repairs, guide & wrap placement, varnishing techniques, cleaning cork, ferrule replacement, repairing fractures and delaminations and installing new seats & grips.