Grob 103 question

On May 24, 8:10 am, "bumper" wrote:
"dsbrantjr" wrote in message

...



Olin: There is an easily-obtainable instrument used for ear surgery
called an "ear polypus" which might be helpful in reaching the o-ring
to remove it and also to put a new one in. Here's a link to one
possible source:
http://www.urbachletter.com/Archive/...ilePolypus.htm.
If the polypus cannot grab the o-ring you might be able to use it to
use a small wire hook to remove the ring. I think I paid $5 for mine
at an amateur radio hamfest. Good luck with your repair.

I also suffer tool addiction. Have all three sizes of the Crocodile Polypus
(got the wife convinced tools are "off budget" and don't count against one's
toy account) - - got them at tool stores over the years.

Haven't needed to replace the O-rings in probe socket - yet. If the small
O-ring failed, I'd sure be tempted to try almost anything rather than
cutting holes in the tail. How about removing the old O-ring using a
modified dental pick (bend a small 90 degree in a long skinny pick)? I'd
also try viewing the procedure with a bore-sope, I've got one that's .165"
OD, but they are available much smaller. It would be possible to insert
bore-scope alongside probe being used to remove old O-ring.

To insert the new O-ring, I'd make an insertion tool using thin-wall SS
outer housing. Compressed O-ring would be pushed out of tube with plunger.

bumper

Getting the o-rings out as bumper suggests should not be a problem.
The first two come out easily with a dental pick. I am not sure the
Crocodile Polypus would help - but I also want a set for my toolbox.
Push new o-rings in place with a plunger made from a piece of brass
rod. The second o-ring will slide over the first with a bit of
fiddling. I luckily avoided having to replace the third one. Again in
my case the damage was frequent removal/insertion of the triple probe
in a club ship. You could see the flat spots where th o-rings had been
abraded and there were very fine black rubber specks in the mount that
were likely from the o-rings. removed the first two o-rings cleaned
out very carefully with non-lint wipes and then installed the first
and then second o-ring and just lubricated the third.

If abrasion like this is the culprit the third o-ring may be in a much
better state becasue very little length of probe rubs past it when the
probe is installed.

Bumpers suggested tool sound like it could work - I'll take one from
the first batch :-)

BTW I just noticed on the esa-systems web site "adapter AV" - a plug
with attachment hole for a "remove before flight" flag and Marc it
looks like it does have a vent hole. (I wonder if W&W stocks those).

Darryl