Wiggy,
 
1.  Remove distributor drive gear.  Remove roll pin and use a bearing puller.  Care required not to damage gear.
2.  Withdraw shaft from distributor case.
3.  Bushes will then knock or press out easily.
4.  New bushes will need to be made.  Generally only the bottom bush experiences excessive wear. Shaft may require metal reclamation.
5. Replace bush.
6. Reinstall shaft assembly.
7. Press on drive gear.  Advance mechanism will need to be removed to allow for support during pressing process.
8. Re install advance mechanism.
9. Check and adjust advance mechanism.
 
Other areas that may be inspected during the above process are:  female hex drive wear in gear and advance (mechanical and vacuum) mechanisms.
 
I offer a price of $180 to perform the above including a professional advance regraph. (have distributor Test equipment).
 
Regards
John  0419673327
 
 

You need to replace the top bearing too.  It wears because everyone forgets to oil the pad.  The wear causes the dwell angle and points gap to change as the revs increase due to centrifugal forces.  Easy to test if its worn just watch the dwell reading on a multi meter while you rev the engine.  If dwell changes then its worn.
 
Since bushes have to be custom made I don't see the need to pay for metal spraying, cant you just machine the shaft (which will have to be done if metal sprayed) and then have the bearings made to suit.

Two fantastic answers. Thanks guys. Issue is they are a good two inches apart and the same size. I have good ones in my original dizzy( the one in the freezer). So I will now attempt something on the one I got from JR and see how it goes. You can feel the slop in it but more at the bottom however the points would stop movement at top somewhat.

GTV6,
1.  As the distributor gear relies on an interference fit, the shaft diameter can not be simply machined smaller.  It is not unusual to have 0.005 inch shaft wear and only 0.002 inch bush wear. A total of 0.009 inch (including the desired original .002).  By replacing the bush the total becomes .007 inch.  A long way from the desired .002 inch.
2.  The oil pad only lubricates between the advance mechanism and the main shaft.
3.  The shaft is so designed to bring oil to both the bottom and top bearing from camshaft oil spray.
 
Worn bushes cause poor engine performance, more noticeable as the revs increase.
Replace the points with an electronic triggering system.
 
Regards
John