軸，傳動齒輪

The combo of items 151 and 153 fit perfectly on my SC4 lathe and the machining on the shaft itself is noticeably smoother than the original. Saved me from having to track down two separate parts.

Replacing the old shaft was a straightforward job since this one comes as a two-piece combo, so I didn't have to hunt for a separate gear. It's been running smoothly on my SC4 lathe for a week now, no wobble or play at the connection point. Exactly what the parts diagram promised.

Bolt holes lined up perfectly with the stock SC4 mounts - saved me having to drill new ones. The machining is noticeably cleaner than the original part I took off.