I measure the barrel as 0.580" deep (not including the lip that the cover fits into) by 1.278" diameter. This seems closest to 14mm x 32 mm without going over. On Esslinger I see springs measuring 14mm x 30mm and 13mm x 32 mm. Which way should I go, one for a slightly narrower barrel (30mm vs 32mm), or for a slightly thinner barrel (13 mm vs 14 mm)? I just noticed Horolovar has a 14mm x 32mm, for a few dollars more. Does it even make a difference? I don't have the Horolovar book to cross-check anything.