Bolts.--These should be of brass if passed inside the ring. Nuts are not
necessary if E is tapped, but their addition will give a smarter
appearance and prevent-the bolts becoming loose.
Bearings.--Bore central holes in the discs to a good fit for the
bearings, and prepare the hole for the exhaust pipe. This hole is most
easily made by drilling a ring of small holes just inside the mark and
cutting through the intervening metal.
For A, B, and C cut off pieces of bearing pipe, 1/2, 1/4, and 3/4 inch long
respectively, and bevel the ends of B and C as shown, to minimize friction
if they rub. File all other ends square. (Lathe useful here.)
Bore oil holes in B and C, and clear away all the "burr." Make scratches on
the bearings to show how far they should be pushed through the case.
Now assemble the case, taking care that the edge of the ring corresponds
exactly with the circles marked on the discs, and clean the metal round the
bearing holes and the bearings themselves. The last are then placed in
position, with the lubricating holes pointing upwards towards the guide
marks on the discs.
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