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#538835 02/23/19 02:21 AM
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What methods do folks use to file out pits in a smooth concave rubs?

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A great deal of care as you do not know how thin they can be.

Two ways I can suggest , make a wooden block the profile of the concave and either wrap a piece of emery cloth round it .
Or , take a half round file cut off the tang and adhere it to a block of wood say two inches deep as a handle and use as a float .
Shaped scrapers can also be used but again with caution and some practice .

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Round mold makers stones or soft stones work great as well.


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Booking African hunts, firearms import services

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Bill. I heat up a chainsaw file to red just ahead of the handle then bend to about a 45. You can now lay the file flat on the rib. I do same with a rod slipped inside some rubber tubing to make a backer for low tack PSA abrasive.

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The bent chainsaw file is working great, Mark. I bent it to provide a handle, and also bent the nose up slightly so it doesnt dig in anywhere.

mark #539435 02/28/19 03:59 PM
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Originally Posted By: mark
I do same with a rod slipped inside some rubber tubing to make a backer for low tack PSA abrasive.

What is PSA abrasive?

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Peel and stick adhesive. (PSA)

SRH


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Originally Posted By: B. Graham
The bent chainsaw file is working great, Mark. I bent it to provide a handle, and also bent the nose up slightly so it doesnt dig in anywhere.


Bill, I just grind a radius on the end to prevent scratching .

Hear is the paper I use. It sticks but does not bond so it removes easily . I also use Norton A275 sheets as well.

https://www.nortonabrasives.com/en-us/a275op-ao-fine-grit-paper-psa-roll

mark #539464 02/28/19 08:44 PM
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What a great place to hang out. You guys and your willingness to share are truly inspirational.

Many Thanks

Travis

mark #539529 03/01/19 11:15 AM
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Originally Posted By: mark
Originally Posted By: B. Graham
The bent chainsaw file is working great, Mark. I bent it to provide a handle, and also bent the nose up slightly so it doesnt dig in anywhere.

Hear is the paper I use. It sticks but does not bond so it removes easily . I also use Norton A275 sheets as well.

https://www.nortonabrasives.com/en-us/a275op-ao-fine-grit-paper-psa-roll

Thanks Mark. Ive been using various diameters of heater hose, split lengthwise. It will flex nicely as the barrel taper changes. I think that paper would well for that use as well.


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