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Finally got around to swapping out the old handle on my SC4 lathe and this one fits the part number 7 slot perfectly, no fiddling needed. The locking action is solid and positive, feels like it clicks into place exactly where it should. Nice to have a proper replacement that doesn't feel flimsy like

The locking mechanism is much more precise than the plastic part it replaces, and it threads in smoothly without binding. Installation took less than five minutes on my SC4 lathe.

Finally got around to swapping the old handle on my SC4, and this replacement locked the tailstock down much more firmly than the original ever did. The machining feels precise, and it threaded on without any binding.