[asathorny]

I know that I am not the sharpest knife in the box but I would have thought removing the trim to be the first job !!!   

[eye30]

As still within warranty I'd be taking to dealer and asking them to fix.

Or at least provide advice on replacing and part number etc

You didn't break it so you do not know actual cause.

[mickd]

Never mind, Calvin, I have the design now, no need for specs:



This suggests it indeed fastens from within, so you'll need to get the trim off to replace it.
If you're keen on one, I can do it up this weekend in any colour you like as long as it is red, then you can paint it black or grey to suit.

Confirm with a few details (including diameter to check I have the right scale) in a PM and we can talk dollars cents.

POST # 32 ! , not starved of activities at all   

[calvinnwq]

@The Gonz

I've removed both knobs by removing the trims and unscrewing them. They look like they have protruding points to guide them into the hole slot.




Measurements


3mm is the diameter of the screw hole. Area between the 5mm -> 3mm is sloped to allow those angled screw heads although the ones here are flat.

[Dazzler]

Interesting thread! 

[The Gonz]

OK, checking dimensions against my model ...Dimensions are good.

I don't see those aligning side posts as vital. It'll work just as well without them.
In fact, you should be tightening the screw by holding the post, not letting those tiny things stop the spinning.

One thing that would improve the finished product is my adding an internal thread because the 3D printed product is a lot harder than the soft plastic you have now.

Can you provide accurate internal and external thread diameters for the screw?
If you're technically inclined, you might even try matching it to one these:
McMaster-Carr

If not, I'll got with the dimensions you will report, and print you two so they match.

[tw2005]

Never mind, Calvin, I have the design now, no need for specs:



This suggests it indeed fastens from within, so you'll need to get the trim off to replace it.
If you're keen on one, I can do it up this weekend in any colour you like as long as it is red, then you can paint it black or grey to suit.

Confirm with a few details (including diameter to check I have the right scale) in a PM and we can talk dollars cents.

Won't you have to crash test it first?

[CraigB]

Another simple replacement being the trim is removed would be a black high tensile 25mm x 3mm cup head bolt and two matching nuts and washers

[The Gonz]

Won't you have to crash test it first?

[The Gonz]

Another simple replacement being the trim is removed would be a black high tensile 25mm x 3mm cup head bolt and two matching nuts and washers

You're no fun, Craig.

[CraigB]

Another simple replacement being the trim is removed would be a black high tensile 25mm x 3mm cup head bolt and two matching nuts and washers

You're no fun, Craig.

I had fun working out required parts and a trip to Bunnings will fix in 10 minutes

[calvinnwq]

Was unable to match with any screws on that site.

Seems to me the external thread diameter is 3.5mm - 4mm. Internal is between 2mm - 2.5mm.

[calvinnwq]

Another simple replacement being the trim is removed would be a black high tensile 25mm x 3mm cup head bolt and two matching nuts and washers

sounds doable as well. but let's try the more fun and aesthetic way.

[The Gonz]

And what's the total length of the screw section, with how many thread counts along that length (thread pitch)?

[calvinnwq]

10mm in length with 6 thread

~1.66667mm thread pitch

[mickd]

Bet this can get #48 posts before we see a  finished item   

[The Gonz]

Righto, I was able to derive an approximate model of the screw based on your measurements and subtracted it from the hole on the post. The important metrics are those permitting the inner diameter to fit and the outer to bite into the plastic with mild resistance.
Job done.

[Dazzler]

A thread about a thread.. I told you this was pretty cool. 

[Dazzler]

 

I think I want one of these now! 

[The Gonz]

A thread about a thread.. I told you this was pretty cool. 

Could have been a thread about a knob but you were being nice.

[calvinnwq]

Legend @The Gonz. We can continue this in PM

[Shambles]

We can continue this in PM

Don't you dare 

[Dazzler]

We can continue this in PM

Don't you dare 

 

[asathorny]

 

[asathorny]

I'm looking forward to when ya start to build the Australian space shuttle 

[calvinnwq]

Righto, I was able to derive an approximate model of the screw based on your measurements and subtracted it from the hole on the post. The important metrics are those permitting the inner diameter to fit and the outer to bite into the plastic with mild resistance.
Job done.

@The Gonz let me know how we can sort the rest out

[The Gonz]

Use the PMs menu option to send me your address and I'll work out postage costs.

[tw2005]

do we get to see the finished product? Or is it pay per view

[The Gonz]

do we get to see the finished product? Or is it pay per view

You've already seen the CAD item. How about once the transaction is complete and manufacture begins, I upload a picture of the items in production and Calvin then uploads a picture of them painted and installed?

[Shambles]

Don't forget the video of the printing