Hey guys. Quick question if i may...
I bought myself a Bonzer Truggy 4wd brushless RC truck


Its a great first purchase and sorry if im not that technical in my description but im fairly new to this RC field.
Im fairly sure its a TAMIYA TL01 varient... correct me if im wrong..

I managed to breat the rear plastic knuckle and so ordered some metal blue alloy ones as replacement.
I looked up the part number and bought the following...

However the threading on the smaller upper arm isnt the same as the thread on the pin that fits into it...

Any one have any ideas why it isnt threaed the same diameter as my truggy?
and /or how do i fit these parts?
If you want any mroe details or a picture to help just say so?
Thanks in advance!

Gareth