Case hardening question

I'm working on a Savage .17 HMR for a neighbor , and he's lost a part . The spring clip that retains the firing pin , extractor , and "cartridge guide" has broken and the guide piece is lost - and I haven't been able to source one to replace it . The spring is on order from Numrich as soon as they can get their doors back open it should be on the way . The guide is basically a mirror image of the extractor , and I have one 90% complete , but I'm wondering if I need to case harden it . I have the stuff , but have one question about post-hardening heat treatment . Where this is a thin layer of hard over a soft core , I'm wondering if I just need to heat , dip in the Kasenite , reheat to red heat and quench , or do I need to temper it after hardening . Or even if I need to harden it at all , It's not under a lot of stress , and the only metal to metal contact will be with brass cases . This is a very small part , about .060" thick by .140" wide and about an inch long .