Spacing blocks a set distance along a complex path

I've created a path in a sketch consisting of arcs and lines. I'm trying to visualize a chain with attachments every 6" on the chain. Is there an easy way to place entities or blocks on the path and specify that they remain x distance along the path from another? When I use a regular dimension between the two blocks then drag them along the path whenever the two start to go around an arc, the distance relation is the chord between them, not the arc length segment.

Is there a way to add the type of constraint I'm looking for?

Thanks!

Tadd

SolidworksSketching