PART NO.  SPL.PAGE  DESCRIPTION                                                             
1A1546    15.A.3    Oil thrower -crankshaft (front) -(engine unit, 1500)
1A1546    sup.4     Thrower -oil -crankshaft -(engine unit, sup)
1A1546    16.A.4    Thrower -oil -crankshaft -(pulley, engine unit, 1600)
1A1546    TC.A.3    Oil thrower -crankshaft -(pulley, engine unit, T.C.)
1A1546    16.A.25   Thrower -oil -crankshaft front -(engine unit, 1622)
                    -changed to 12H775  -Com (e) 16GC/8263 (1622 engine)
12H775   16.A.25   Thrower -oil -crankshaft front  -Com (e) 16GC/8263 (1622 engine) 
                    -was 1A1546 Fin (e) 16GC/8262
AEH427     TC.A.7    Thrower -oil -(crankshaft, engine, Twin Cam)
11G81     15.A.3    Pulley -crankshaft -(engine unit, 1500)
11G81     sup.4     Pulley -crankshaft -(engine unit, sup)
11G81     16.A.25   Pulley -crankshaft -(engine unit, 1622) -changed to 12H773
    Com.(E)16GC/8263
AEH428     TC.A.7    Pulley for crankshaft -(crankshaft, engine, Twin Cam)
2H326     15.A.3    Key -crankshaft gear and pulley                       (#605 Woodruff)
2H326     sup.4     Key -gear -(crankshaft, engine unit, sup)             (#605 Woodruff)
2H326     sup.4     Key -pulley -(crankshaft, engine unit, sup)           (#605 Woodruff)
2H326     16.A.4    Key -pulley -(crankshaft, engine unit, 1600)          (#605 Woodruff)
2H326     16.A.4    Key -crankshaft gear and pulley -(engine unit, 1600)  (#605 Woodruff)
2H326     16.A.25   Key -crankshaft gear and pulley -(engine unit, 1622)  (#605 Woodruff)
2H326     TC.A.7    Key for gear -(crankshaft, engine, Twin Cam)          (#605 Woodruff)
2H326     TC.A.7    Key for pulley -(crankshaft, engine, Twin Cam)        (#605 Woodruff)
1H765     15.A.3    Nut -starting dog -(crankshaft pulley, engine unit 1500)
1H765     TC.A.7    Nut -starting -(crankshaft, engine, Twin Cam)
1H765     16.A.4    Nut -starting -(crankshaft pulley, engine unit 1600)
1H765     16.A.25   Nut -starting -(crankshaft pulley, engine unit 1622)
1G1319    15.A.3    Washer for starting dog nut (lock) -(crankshaft, engine unit, 1500)
1G1319    sup.4     Washer -locking -starting nut -(crankshaft, engine unit, sup)
1G1319    16.A.4    Washer -lock -starting nut -(crankshaft, engine unit, 1600)
1G1319    16.A.25   Washer -lock -starting nut -(crankshaft, engine unit, 1622)
AEH429    TC.A.7    Washer for nut -lock -(starting, crankshaft, engine, Twin Cam)

The 1H765 Dog Nut, to accept the hand crank (starting handle), is the seme for all MGA, including Twin Cam. The picture of the short dog nut should be correct. The long neck dog nut in the illustration is likely a drawing error from the original Service Parts List.

The 1G1319 locktab washer for pushrod engines is commonly flat, but aftermarket parts may be slightly cup shape at the edges. A notch in the center is optional, as it does not engage any key. To prevent the standard locktab from rotating, it must be hammered into a notch in the face of the crank pulley. -- The AEH429 locktab washer for Twin Cam engines is flat with a finger tab at the outside edge that engages a drill hole in the face of the crank pulley (see the red line illustration drawing). -- The 2H326 Key for the front pulley and crankshaft "gear" is a standard 605 Woodruff key

The 11G81 crank pulley for pushrod engines is two-pieces stamped sheet metal riveted to a machined iron hub. The machined impression in the front face of the hub (opposite the keyway) is the anti-rotation notch for the locktab washer. The timing mark notch is at the edge of the rear face flange opposite the keyway. -- The AEH428 crank pulley for Twin Cam engines is one-piece cast iron. Anti-rotation for the locktab is a hole drilled in the front face. It also has two 1/4-28-UNF tapped holes that may be used for a puller.