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How best to secure loose tonearm bayonet fitting?

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Posted on February 15, 2017 at 10:54:44
copydex
Audiophile

Posts: 217
Joined: February 9, 2007
 I have a tonearm with a removeable headshell, where the connection between the detachable headshell and its bayonet mounting is good/secure, but where the bayonet mounting itself is a little loose within the tonearm tube. I have tried tightening up the set screw on the underside of the armtube but, with not very much pressure at all (certainly less than would be experienced when just carefully removing/re-fitting the headshell), the bayonet housing becomes loose again.

I want to secure the bayonet housing properly, with a slow curing bond of some sort which would allow me to set correct re-alignment of the headshell before it goes off, and was wondering what others would suggest to use in order to do it? I had toyed with the idea of adding a second set screw but fear the mess I might make of the drilling process and the stress it would put on the arm bearings, so suggestions for an alternative fix would be appreciated.

 

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RE: How best to secure loose tonearm bayonet fitting?, posted on February 15, 2017 at 14:28:15
PAR
 May I just suggest that you identify the arm in question. For all I know the bayonet problem may be a well known issue with lots of experience about it from inmates on a fix that is specifically related to your particular model.

On the other hand, maybe not, but identification would at least remove that potential approach.

 

RE: How best to secure loose tonearm bayonet fitting?, posted on February 16, 2017 at 00:51:46
tygersmoke
Audiophile

Posts: 103
Location: Lilli Pilli, Sydney
Joined: April 1, 2016
 Hi,

I'll just copy and paste what I wrote on another website about how I repaired a Dynavector DV 501.....

"I also had to fix the bayonet headshell socket with bearing mount retaining compound, as the two machine screws that hold it in place had slowly enlarged the hole in the softer aluminium tonearm tube. I have an Audio Technica/Audiocraft tonearm that has the same symptoms; probably fairly common in 30 year old removable headshell tonearms. Repair was simple with the use of bearing retaining compound."

Here's a few pics to show what I did; the compound allows removal later on if necessary. I moved the bayonet around a bit while applying to ensure good coverage between the armtube and the socket's internal surfaces.

Regards,
Phil















 

RE: How best to secure loose tonearm bayonet fitting?, posted on February 16, 2017 at 03:37:57
copydex
Audiophile

Posts: 217
Joined: February 9, 2007
 Many thanks, Phil, that is really helpful.

May I just ask, when applying the Loctite retaining compound, did you apply only through the screw holes (and gently move the bayonet to move around the surfaces within those holes), or did you apply any at the aperture of the tonearm tube by sliding out the bayonet fitting entirely?

 

RE: How best to secure loose tonearm bayonet fitting?, posted on February 16, 2017 at 14:18:08
tygersmoke
Audiophile

Posts: 103
Location: Lilli Pilli, Sydney
Joined: April 1, 2016
 Just through the screw holes; I didn't want to apply too much so that I couldn't remove it.

As it happens, I will need to undo it as the tonearm needs to be rewired. I am hoping that the retaining compound lives up to it's reputation of allowing the surfaces to be freed!

Regards,
Phil

 

RE: How best to secure loose tonearm bayonet fitting?, posted on February 17, 2017 at 00:40:53
copydex
Audiophile

Posts: 217
Joined: February 9, 2007
 Thanks again for the information, Phil, much appreciated. I am awaiting delivery of some of the Loctite 641 and look forward to getting the tonearm back in use again.

 

The Red is removable, the Blue isn't! nt, posted on February 18, 2017 at 19:41:45
risabet
Audiophile

Posts: 3197
Location: SoCal
Joined: January 10, 2005
 nt



Science is the great antidote to the poison of enthusiasm and superstition.

Adam Smith

 

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