I have a bit of an odd problem with my sl66.

Half way through a shooting session, the bellows seemed to stop going out the whole way.

They retract the whole way, and they go out to about 2/3rds of the normal extension, but at that point there is suddenly a lot of resistance and I dare not push it harder.

I've compared with my spare sl66 and I'm not loosing it. Its definitely only 2/3rds.

Any thoughts on repair?

Thanks all