[R-390] KNOBS

[dog]

I repaired a broken fingers large knob. These numbers may be all wrong, 
but you get the drift. I bought or had a 3/8" drill, chucked it in my 
hand drill, drilled out the old fingers and hole to the bottom. Then I 
got a 3/8od x 5/16id or whatever size the id shaft is, bronze bushing 
from ebay for a few bucks (actually 2). Cut a slot in the bushing to 
mimic the fingers, cut to length, maybe I cut 2 slots, can't remember 
with a small coping saw ruining the blade. Glued the bushing in the old 
knob with slow set epoxy and the knob installed on the shaft so it 
looked straight. Let it set for a week or so. Been working fine ever 
since and that's been a couple years now. I think I even used the same 
lock ring on the thing. Lots cheaper than buying a replacement and I'm 
cheap. YMMV. Who's got a machine shop? In my dreams.

Dave N3DT

On 4/7/2019 21:42, Pete Williams wrote:
> I've had broken internal fingers on the  tuning/band  change  knobs.  I had
> a  skilled  machinist bore out to  the  required depth  and   diameter,
> make up  a  brass insert  with  shaft  diameter and tapped  to  take  the
> bristos. The  insert is  held in glued by one of those 'u-bute' Locktite
> liquids----- never  had one  separate.
> Anyway , re marking the  shaft...…  how often  would one  take off the
> knobs.?
> If it  was of  major  concern why not  remove the  tuning  shaft  and  file
> on  a  couple  of  flats.
> Alternatively.  get some  shafts  turned up as  replacements  with  the
> flats  properly  machined.  I've  done that too.
> Cheers
> Pete  VK3IZ
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