COUPLING REPLACEMENT

Please tell me the trick in re riviting a replacement coupling in this case to the rear of the tender on my Bristol Castle. Do you need four hands? How do you hold the chassis, what do you put under the head of the rivet, what do you use to spread the rivet in the hole?
Is there a better way and where would you get a thin stepped bolt to use instead?
PS the engine is running great after a complete overhaul.

Greetings.
1. Choose the correct replacement coupling for the period of your item.
2. Choose the correct rivet for your coupling i.e. long or short shaft and shallow step for metal couplings  and deep step for plastic couplings.
3. Lock a suitable diameter short metal shaft upright in a vice.
4. Place the coupling on the rivet and position that assembly in the hole in the item making sure that the rivet is right home and the coupling can pivot freely.
    To help hold the assembly in place, put a spot of blu tac under the coupling shaft to temporarily secure it to your item.
5. Now comes the tricky bit, holding the item between your thumb and 3rd and 4th finger, place the assembly so that the head of the rivet is sitting on the end of the rod.
6. Now hold a point ended metal punch between your 1st and 2nd finger so that the point is resting on the end of the shaft of the rivet.
7. With your free hand strike the end of the punch with a hammer. The metal punch will spread the end of the shaft of the rivet locking it in place.
8. If you are dealing with a plastic bodied wagon you will need a punch wth a concave tip to spread the rivet end out over the plastic.
    Note, if you prefer, you can do the whole proceedure upside down i.e lock the punch in the vice, rest the shaft of the rivet on the punch and,
    holding the rod between your 1st and 2nd fingers, strike it on the base of the rivet.    
9. If you do not have a long enough rivet, you can secure the rivet coupling assembly with a drop of Loctite.
   This must be put into the rivet hole with the item base up and take care to wipe any excess from the coupling pivot area before you insert the coupling/rivet assembly into the rivet hole.
   If you use this method, leave the item base up until the Loctite has completely set. If you don't you will have a non-pivoting coupling! 
   I hope this helps.
   Kind regards,
   HDMR3864