New Member Question - Row counter for bond machine

In seeking an answer to a question about fitting a row counter to a bond incredible sweater machine, i came across this site. i am lousy on computers and don’t know what i should be asking and where so i hope someone finds this. I was given an incredible sweater machine and am trying it out. i am mysftified as to how to fit the row counter as the book shows it fits to the back of the bed but i can’t slot it on. am i missing something, or is something missing from the row counter, screw attachment etc? any help greatly appreciated.
Many thanks
Mags
South Wales

Anyone know the answer to this?

http://www.allbrands.com/products/6957-american-bond-20064-row-counter-for-u-s-m-knitting
I ordered here yesterday … But the price was 29.99! … :confused:I do not know why today is 49.99 …:scream: