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West  Wickham,  near  Croydon. Mr. Bell   Certainly the  sound  on  two  musicals  I
       the proprietor of Sound  and  Screen   ran  as test films  had  extra clarity
       Services estimated, over the  phone that   compared to previous runs.
       the  cost  would  be  about  £100 and this
       was very nearly correct,  in the event.   Bell  &  Howell  discontinued  their
       When the machine was  returned  some   16mm film projectors circa 1980/2 so that
       two  weeks  later,  by  road  transport,  I  found   the last  of the  TQ3  machines must  be at
       that  the  machine  ran  extremely well; it   least twelve or fifteen years old.
       purred gently like a small-satisfied kitten.   It is a wise precaution for any owner or
       Meanwhile I had been  using my  TQ3   prospective  buyer  of  a  TQ  machine  to
       Model 1694 and my wife remarked that it   remove the rear of the case of  the
       sounded noisy so  when the  newly    machine,  (two  screws  at  each  side  and
       serviced machine was returned I ran   three along the bottom) to examine the worm
       mine alongside and mine was noisy by   gear. This  should be slowly  rotated by
       comparison. In fact it had begun to   means of the inching knob.  If there is the
       sound  like  a  miniature  pneumatic  drill!   slightest suspicion that  there is a crack
       Quick  removal  of  the  rear  of  the  case   or hairline fracture the  use  or  possible
       revealed  that although my  worm was   purchase should  be  abandoned until
       still in position it was split for half its   the machine has been  sent for repair.
       length  and  a  hairline  crack  was  evident   This will obviate the  possibility of it
       along the other half.                ceasing to function in the middle of a show
       Another call to Mr. Bell and it was   and  prevent the  possibility of  damage  to
       agreed that my son and I would deliver it   other parts of  the gear train. If the
       in person by car. This proved to  be  a   machine has had the worm gear replaced
       messy cross-country run from Reading to   the new worm  is a mid gray color
       West Wickham and I decided to  have   easily  distinguished  from the original
       it returned by road transport. In  his   pale cream plastic model.
       small workshop Mr. Bell  showed us  the   Now  that  my  own  machine  has  had  this
                                            repair / overhaul and is sounding very
       new type of replacement worm of which   smooth I can  use it  with  every confi-
       he had a good stock. The new version is   dence.
       made in one solid piece in a distinctive gray
       material.  Apparently  he  is  repairing  about
       one  a week with this problem. The cost of
       the worm itself is  £29.50 but  if a worm   This article was originally published in
       damages    other  gears   when   it  the UK magazine ACE, it is reproduced
       disintegrates these will  need replacement   in Reel Deals with the kind permission
       as well.                             of the author Alan Lott.
       On receiving the invoice for repairs to my
       1694 1 noticed a small charge for fitting
       two Zenor diodes  for protection  of the   Parts for Bell & Howell projectors are
       motor speed control integrated  circuit.   available from advertisers listed in Reel
       Apparently this protection had  not been   Deals.
       fitted to the first production  runs  and it
       is sensible to fit these  two  small items
       at any  time that  the machine is sent for
       servicing. I  noticed  also  from  the  invoice
       that the sound  optics had been cleaned.
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