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I don't have any experience with the inserts, but I believe the weak point is the softness of the stock RSFB. Slipping the inserts may firm things up, but wont they still wiggle when the stock rubber gives?
Either way, if you are going to install the inserts, might as well spend the extra hour and half and do the full white line bushing. That way you are not mixing materials. If you rent the tool from hpa, removing the stock bushings is extremely easy. The install of the two piece whiteline bushings are easy as well.
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