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Discussion Starter · #1 ·
I'm swapping MSHs between two of my Springfields. I figure that while I have them off, I'd polish the mainspring tunnel of each one as Kuhnhausen suggests. He says to use a small round stone or Craytex rod to remove burrs and machining ridges.

Here are my questions:

1) Where do I get a small round stone or Craytex rod? How much will that cost?
2) How do I get the metal filings out of the tunnel?
3) Do I need to lube the tunnel and spring? If so, with what?

Thanks in advance.
 

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You can use a Flex Hone for smoothing and polishing the interior of the mainspring housing. Grits are available in 120, 180, 240 and 320. The proper Flex Hone oil should be used with these abrasives to ensure a long useful tool life. The size that would prove most useful for the mainspring housing is the .315" (8mm) size Flex Hone. Costs run from about nine dollars to about fifteen dollars depending upon how fine the grit you choose. These can be obtained from Wholesale Tool, http://www.wttool.com or from MSC, http://mscdirect.com or from Brownells. Small amounts of the proper hone oil can also be obtained from the above suppliers. These devices work very well for this purpose and I have used them with great success for quite some time.

Clean out the spring tunnel with brake cleaner or some other cleaning agent and relube with FP10 as suggested or some other high quality lubricant. Also be sure to polish the mainspring cap to a nice smooth high lusture to go along with your newly cleaned and polished mainspring interior.
 
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