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eHam Forums => Boat Anchors => Topic started by: W7GIF on August 30, 2012, 09:47:59 AM



Title: Collins 51J-4 VFO Adjustment tool
Post by: W7GIF on August 30, 2012, 09:47:59 AM
Does anyone have a 51J-4 VFO adjustment tool (co-axial spanner wrench and screwdriver) that they can spare? VFO trimmer needs adjustment  (dial end-point errors are consistent band-to band).

Thanks......


Title: RE: Collins 51J-4 VFO Adjustment tool
Post by: KD0REQ on August 30, 2012, 01:50:32 PM
is this a locknut over split shaft adjustment?  Sears has hollow-shaft nutdrivers on the rack... drill through the handle, get a long-blade screwdriver, should fill the bill.  might need to use a "lineman's bit", but they should have those also.

used to be standard Xcelite parts for this, but availiability is substantially lacking from what it was in the 60s and 70s.


Title: RE: Collins 51J-4 VFO Adjustment tool
Post by: W7GIF on August 30, 2012, 04:49:24 PM
is this a locknut over split shaft adjustment?  Sears has hollow-shaft nutdrivers on the rack... drill through the handle, get a long-blade screwdriver, should fill the bill.  might need to use a "lineman's bit", but they should have those also.

used to be standard Xcelite parts for this, but availiability is substantially lacking from what it was in the 60s and 70s.
Thanks for the lead. I've modified several Xcelite nut drivers to convert them to spanner wrenches for various projects. The hollow-shaft drivers would be a real advantage, since the Xcelite's that I've modified have solid shafts, and are a real pain to drill out. Fortunately, I've had a ham on the Collins Collectors forum volunteer to loan me his Collins tool. Pretty darn generous of him.

Thanks again, and I'll likely fashion my own tool using your suggestion, for any future needs.

73's.....


Title: RE: Collins 51J-4 VFO Adjustment tool
Post by: W6OU on August 31, 2012, 09:44:41 AM
I made one from a screwdriver with a thin blade 7/32" wide. I used a Dremel motor tool with a metal grinding tip to grind a slot 5/32" wide and 1/4" deep. This left a fork tip with two 1/32" tips.