Pivot Arm Pin Assembly (Acorn nut/bolt)

The used TM I recently bought was missing a complete piviot bolt and acorn nut assembly. Since I was placing an order for it from the factory, I decided to replace all 8 at the same time; no real good reason other than combining shipping. In case anyone is interested the cost is $3.00 per assembly.

I don't know if it is a problem, but the hardware pieces are not the same as existing on my 2000 3124KB. The new hardware looks like a rivet instead of a bolt and their is a cheap looking spring steel cap instead of an acorn nut. There is also a washer included. I assume what I received is a direct replacement for my "older" hardware. Is this true? If so, it appears I would insert the pin from the exterior, add a washer on the inside of the TM and tap the steel cap on the inside end of the pin. Looks like it would be a two person job, as someone would need to outside to "back up" (hold the pin in) while the other person tapped the cap into place on the inside. Does this sound correct?

It does look to me like the newer hardware may be less robust than the original "acorn" configuration. I worry that the pressed on spring cap will slip off in transit and I will loose the pin. If anyone has the new configuration, how is it working for you?