Quote Originally Posted by andrewM View Post
It is quite a fine operation, to ensure no jagged bits intrude and there is no overlap into the tap area. The TP diameter also seems to depend upon whether or not you use a leather washer, in which case the tp would be rather larger that with a synthetic washer. The links previously mentioned cast quite an amount of light on the optimum size for the tp, especially for the Mk3. I suppose, if you make a narrower tp, then you can then always widen it whereas the reverse is not so simple.

It will be very interesting to know how you get on.

A
Thank you Andrew. I can't wait to test the rifle with the sleeved tp. I will go for 2.8 mm first. A friend is making a brass insert, 5.6 mm. I will try to find a way to measure the exact diameter of my transfer port, but if it's actually 5.5 mm, I can always reduce the diameter of the insert.

Tested RWS Hobby's this morning before work. Don't know how they group, but power is up to 6.6 ft/lbs (500 ft/s, 11.9 gr).
That's already a lot better. But the gun is slammy.
Yes I need a smaller tp

Also did some adjustments to the trigger. It's very good now! On the verge of being dangerous. I will increase sears engagement a bit to be on the safe side. I only need the lightest amount of pressure to fire the gun. This is a third variant trigger. Not as pretty as the second and first, but it's rather good! I'm sure that polishing helped, but it's easy to adjust too.