Truly astonishing that so few quality 4-blade easels are still being manufactured. The only pneumatic 4-blade manufactured anywhere is the Kaiser Pro 4-Blade 12x16 inch (30 x 40cm) Adjustable Enlarging Easel. In the meantime, I plan on buying as many 4-blade Saunders easels as I can find on ebay for parts, simply to back up my current Saunders workhorses.