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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DOOIUCJJDV7KTXJ7NKBHEASDRMHJRE2U/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "DOOIUCJJDV7KTXJ7NKBHEASDRMHJRE2U",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/DOOIUCJJDV7KTXJ7NKBHEASDRMHJRE2U/",
    "sender": {
        "address": "msa (a) latt.net",
        "mailman_id": "baff0a54c5b74d2a8a1de1990372243e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/baff0a54c5b74d2a8a1de1990372243e/emails/"
    },
    "sender_name": "Majdi S. Abbas",
    "subject": "[amsat-bb]  HOWTO: Insulate the Arrow's elements",
    "date": "2009-08-15T19:09:39Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\n\tI know there has been some discussion here in the past on\nArrow modifications -- specifically, either electrically lengthening\nthe elements, or insulating them from the boom.\n\n\tI opted to try to insulate the elements from the boom, rather \nthan lengthen them.  This was mostly due to my concern that it would be\nhard to ensure an electrically solid lengthening using commodity hardware.\n\n\tOne possible approach:\n\n\tEither re-drill to expand, or ream out the existing holes in\nthe boom, and install nylon bushings through both sides, possibly placing\na little epoxy on them, to make them a permanent part of the boom.  Then\ninstall the elements as normal.  This would make for a nice finished \nproduct, but would require 20 bushings, which were in the range of 0.60-\n0.70 USD each at the hardware store.  This makes it the most expensive\noption.  I opted for a much less expensive option using 1/4\" neoprene \nbibb washers, of the type used in compression fittings (check the \nplumbing supplies aisle -- I was able to procure 25 of these washers for\n$3.49.)\n\n\tI did make one observation about the boom itself -- it is exactly\nthe width of a standard roll of 3M vinyl electrical tape.  \n\n\tGiven this, with the use of tape, it should be possible to use \ninsulating washers.  Here's how to do it:\n\n\tInsulate the boom from the elements by removing the #8-32 \nthreaded rod from each, and carefully wrapping 1 1/3rd turns of vinyl\nelectrical tape around the center.  Stretch the tape somewhat as you do\nthis, and then mold it into the threads in the rod using your fingers.\nRemoving the threaded rods entirely is necessary to ensure they are \ncentered, or you will have trouble getting the elements to fit once\nthe insulating washers are in place.\n\n\tOnce this is done, carefully install it into the boom, rolling \nt in the direction of the threads (and tape) to avoid damaging the tape.\nIt is a tight fight, but it is possible to do so.  You should be able to\nsee the tape just barely protruding from both sides of the boom.\n\n\tInstall a 1/4\" neoprene bibb washer (nylon washers could also be\nused, but those were $0.39 ea, and my goal was to keep this under $5) on\neach side, and then reinstall and tighten the elements.  \n\t\n\tIf you have the split boom model, you may have some trouble with\nthe 70 cm element that joins the halves of the boom.  You might need to \nream out or file the holes in the copper tubing inside the boom to get a\ntape wrapped threaded rod insert to fit without disturbing the tape.  \nWorst case, this could involve drilling out the blind rivet, removing \nthe copper insert, expanding the holes and then deburring them, and \nthen reinstalling it.  If you don't have a deburrer, a large enough\ndrill bit would do.  If you don't have a blind (\"pop\") riveter, you \ncould reinstall it using a small nut and bolt.\n\n\tThe entire process should take about 15-20 minutes.  Total cost\nwas $3.49 for the 1/4\" bibb washers and a few inches of electrical tape,\nwhich I had on hand.  Even with tax, this is less than a $5 modification.\n\n\tUnfortunately, I've loaned out my digital camera for the day, so\nI don't have any pictures of this modification, but it's pretty straight-\nforward.\n\n\tI hope this has been helpful to someone who was considering this\nbut wasn't sure what they needed from the hardware store.\n\n\t73,\n\n\tMajdi, N0RMZ\n",
    "attachments": []
}