Stradale Gearknob - Needs Work!

[AndyGuyton]

Thanks Chris. Any idea what wood the original was made from, and what the threaded insert was turned from? Does anyone have an original that we could borrow to get them bang on??

[john]

The wood has very little grain figure.
I'd say it was a mahogany.
Maybe Sapele.
Lime would be an alternative and probably cheaper.

[AndyGuyton]

I have plenty of African Mahogany, maybe try that first and see what happens...

[ProtoTipo]

Thanks Chris. Any idea what wood the original was made from, and what the threaded insert was turned from? Does anyone have an original that we could borrow to get them bang on??

As John says, quite a dense grain.
The captive thread is steel, I'll check the thread on the stick I have. The original stick is quite substantial, hence the 20mm ID on the knob.

The colour of the wood changes a lot where the clear coating wears through (see photos of Beta S1 knob).

[David J]

I have just removed the gearknob from the car, it is the Beta S1 type. I believe the thread to be M10 x 1 (fine thread)

It has metal thread insert for wood as shown below.

https://www.ebay.co.uk/itm/M4-M5-M6-...-/153044832859

David

[David J]

I forgot to add the thread insert is recessed well into the gearknob by a good 1.5” to 2”

[AndyGuyton]

Thanks for the info David. They should be underway over the next couple of weeks. May get our own inserts machined...

I forgot to add the thread insert is recessed well into the gearknob by a good 1.5” to 2”

[AndyGuyton]

Slight discrepancy with the measurements. 74mm + 9mm = 83mm not 85mm. Which overall measurement do I go for?
Maybe the measurements are to the start of the outer diameter radius?....that would make sense.

Thanks chaps.

[ProtoTipo]

Slight discrepancy with the measurements. 74mm + 9mm = 83mm not 85mm. Which overall measurement do I go for?
Maybe the measurements are to the start of the outer diameter radius?....that would make sense.
Thanks chaps.

The 74mm is the length of the flat part on the side, but it's on a slant, don't pay much attention to that.
The vertical measurement from the bottom to the edge of the radius at the top is actually 85mm - 9mm = 76mm.
The overall height is 85mm.

I could make a proper engineering drawing on the computer?
The drawing on the left of the above is the actual shape and proportion.

[Guy Mayers]

I have just removed the gearknob from the car, it is the Beta S1 type. I believe the thread to be M10 x 1 (fine thread)

It has metal thread insert for wood as shown below.

https://www.ebay.co.uk/itm/M4-M5-M6-...-/153044832859

David

Ha! That explains a lot.. The insert on mine must be seized on the gearstick thread! It's been that way for 40 years!

Guy