The old layshaft was worn, which is quite not unlikely as theese shafts take quite some load.
To avoid such premature wear, we went for a hi grade replacement.
Minis have a construction problem around the oil pickup pipe. As the sucking end of the pipe is located on the left side of the case, in a longer left-hend curve, the engine might suffer from oil starvation. To prevent this, it is adviceable to replace the original item with a central oil pickup type.
The oil pump is also an item that usualy has short service life in a mini engine. The reason is also costruction related. The engine shares the oil with the gearbox. There are always metalic particles in a gearbox it is part of their "normal" operation. Unfortunatly the oil pump is before the oil filter in the circuit, soo it sees unfiltered oil. To lessen this problem. I put this little gadget in the oil line. This is a small filter with a magnet. If this part is looked at from time to time, the oil pressure will stay strong much longer.
An often overlooked item: the selector oil seal.
A very slight preload is necessary on the shaft bearings
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