G'day Jarrod,
Apologies for not replying sooner, haven't been on here for a while, bloody forgot I posted on here to be honest. Yes that is one of the parts.
I have copied a post I put on Smokstak with a few photos as per below.
"G'day,
I?ve received a bit more info on the engine from my mate Ian today, as well as the photos of the damaged/missing parts that have been fabricated.
The bore is 5 ??and stroke is 9 ??. Flywheel size is 36? x 4?.
When the engine was received the Half Compression lever/cam assembly, the roller (located between Half Compression lever and Exhaust Rocker) and the end (tail) of the Exhaust Rocker Arm were all missing. Below is a description including photos of how the parts were fabricated/repaired.
Exhaust Rocker Arm ? the broken tail piece was fabricated and brazed to the remainder of the original rocker arm, the piece of white paper indicates where it was joined. As the profile of the broken part was not known the profile of the new piece was continued on from the profile of the original piece (hope that makes sense). The lug on the tail has been threaded to accommodate the cap head screw.
Roller ?The width was machined to the same dimensions as the cam located opposite on the sideshaft, the diameter was not known either so a guesstimation was made.
Half Compression Lever/Cam ? No known dimensions so more guesstimation from photos and videos viewed on the net. As you can see in the photos the cam profile was brazed on to the body, this was re-shaped several times when trying to start the engine.
Hopefully the photos will help explain things a lot clearer than what I have attempted to do.
Whether these fabricated parts are even close in dimensions/profile is unknown at this stage. With that in mind if anyone could provide drawings/tracings and or dimensions of these parts it would be a big help to get this engine running."