I removed the brass transfer port that only had a round hole only, for pellets. Heated it, used a round punch to unscrew, easy. I installed the Huma dual hole transfer port which is really one large hole with a bridge in it so the slugs don't fall in. Without the round hole to tighten it using a punch, I tightened it the best I could by hand with the barrel in a vice. After I re-installed the o ring from the old part, the one toward the stainless steel part, the o ring has a little front to back play in it. Problem or no problem? It is the o-ring at the tip of the broken pencil in the pic.
Tuning FX Impact Huma dual hole transfer port question
- Thread starter cmatera
- Start date
It won’t be a problem, Carl. But know that if you originally had your liner indexed and marked, to a reference mark on the outer barrel that lines up with a mark on your liner, you will have to re index. Thread pattern differences will cause your outer barrel to not fall onto the same exact place as the factory brass TP. If you had previous reference index marks it will show that.
Lastly, with barrel out and pellet probe removed and inserted into the TP and TP holes aligning, scribe an outer mark on the probe, against the outside circumference edge of the new TP with either a mechanical pencil or very fine tip sharpie(best)
When you re install everything, and with the cocking handle in the closed position, see if that scribe mark falls exactly on the edge against that transfer port. If not, you will have to extend or retract the pellet probe block onto the cocking rod.
Lastly, with barrel out and pellet probe removed and inserted into the TP and TP holes aligning, scribe an outer mark on the probe, against the outside circumference edge of the new TP with either a mechanical pencil or very fine tip sharpie(best)
When you re install everything, and with the cocking handle in the closed position, see if that scribe mark falls exactly on the edge against that transfer port. If not, you will have to extend or retract the pellet probe block onto the cocking rod.
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One more- with the barrel out, place the new TP side by side against the factory TP. Make sure the breech ends are perfectly in line with each other. Is the factory hole lengthwise in line with the new TP’s opening? Seems to me on one project I had to dremmel the new transfer port opening longer, towards the breech opening, to match up to where the factory opening started. On the downhill edge(edge closest to the o ring your pencil is pointing at, the edge of the Huma tp matched up with the factory’s
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My barrel was not indexed yet, so no problem there. I also put the liner in a carbon fiber tube, but did not glue it having never shot this barrel. I put in the probe (Huma also) and marked it with a fine sharpie as you suggested. That will make things a lot easier later. I did compare the old TP alignment with the new. It looks perfect.
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I do not put lock tite on mine so removal if necessary will be easier. This is because I change things around a lot and may need to take things apart however you have to keep a eye on it, like for example unscrewing the moderator off now can break the tp loose. I made a tool to grab onto the tp now that it has that thin bridge on it. I believe it was a simple 3/8 or 1/2 copper coupler from a hardware store that I put a split lengthwise on it. Now I can put it on the TP and a properly placed visegrip or softvise to pull it off if nec. let me see if I can find a picture of it.
of course you could flip the barrel around so the TP is in the soft vice, then vice grip the barrel.
Allen
of course you could flip the barrel around so the TP is in the soft vice, then vice grip the barrel.
Allen
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Great idea! I think the barrel in the vice (with soft jaws) and the copper on the TP is perfect. I'd hate to take a chance buggering the finish on the barrel.
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I just used rubber that I had cut from a couple old mud flaps in the vise and on the vise grip turned old one off with a punch after heating for like 15 seconds cleaned the threads installed blue loctite after it cooled and tightened with rubber in vise grip jaws didn't take that much tightening just tightened till it started slipping in either the vise or the vise grip blue loctite will keep it tight
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I've tried both Huma-air and Ernest dual TP. From .22 to .30, all the o-ring at this location will play around.
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I just got one, just opened that package and checked it out screwed to my new tp and it is the and exact way
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