Is it bottoming out? If not, just tap/hit/pound it in, after cleaning & checking that there is actually a 'metal ledge' that it will butt up against when fully seated. If the bore is straight through, expand the tubes OD by hitting it with something tapered, a center punch, drift, socket, whatever. Then a Thin smear of sealant and tap it into place.
Don't get it stuck on the taper so well that you mangle it up when removing it. The


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