I bought a Linhof-Sch. Xenar 105mm/3.5 lens which is mounted onto a Syncro-Compu r shutter. The lens works reasonably fine for me with all the speeds appearing t o be right on, except the shutter speed setting from 250" moving to 500" where t he moving ring is really tight and hard. It looks to me that this kind of old sh utter is driven by spring mechanism to decide the speeds, so that the higher spe ed might need greater spring tension making the setting there harder than the sl ower speeds. Am I correct? Can anyone outthere convince me if this is a problem or the nature of this kind of shutter? If it is a problem, is there simple way t o DIY than seeing a repair? Thanks in advance!

Dongyun