A quick internet browse indicates there are more copies of the original design...!!

Snap-On CF-49A; Herbrand VL-540; Lisle CF-49A; New Britain VL-151; Cornwell VT-124A; Mac CF-49A; Kennedy VT-49; Indestro CF-49A; OTC; Blackhawk VT1002; Wilde 695A; Duro Chrome CF-49A; Toledo 304185; Bonney RC-120; Cal-Van 578....

email (option): ian@wright52.plus.com

Thank you, Ian.

I will start looking on Ebay.

I use a B & S 19063
They used to be around $ 25 ( Aus) they now seem to be $ 75 - $ 150 US
If I kne they would inflate like that would have bought a case of them not just 2
https://www.amazon.com.au/Briggs-Stratton-19063-Spring-Compressor/dp/B002WNY2YS/ref=asc_df_B002WNY2YS?tag=bingshopdesk-22&linkCode=df0&hvadid=79989544424846&hvnetw=o&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4583589114429835&psc=1