MSA hex key -- size?

[Sam Inglis]

I have a 1970s MSA Classic and the left knee lever is slipping at the point where it's attached to the circular cross rod (sorry, not sure what the technical term is!). It's attached using a hex bolt, but for the life of me I cannot find the right key. Can anyone tell me what size it should be? 3/32" is too small and none of my metric keys fit.

[Norman Evans]

If the 3/32 is close, it's probably 7/64 or maybe 1/8. That's the next two sizes in American Standard. Here is a chart that might be useful.

[Larry Bressington]

The bell crank ones are 7/64

[Sam Inglis]

Thank you folks -- yes that's the one.

[Jim Palenscar]

yup- the screw should you need to replace it is a 6-32.