For some time I have owned a couple of Interarms and Whitworth 98 variations. Never paid much attention to them and set them aside as 'project guns'.

Well, a couple of months ago I pulled one out of the safe and began to 'play' with it and make some upgrades. Added a 3-position safety, first. Then I decided to lose the factory trigger with its horrendously long pull and install a Timney. It's about this time when things started to go astray. Seems the Timney trigger I have will not work with a notched cocking piece. Works fine on the flat-bottomed, commercial cocking piece that I have in another Interarms.

This brings me to my questions:

1) Is there a source for the flat-bottom cocking pieces?

2) Do I have the wrong Timney for my application and the notched cocking piece? The Timney I have is the #201, described as "M98FN" Do I need the #202, described as "M98K"?