Trust you are doing well. I am busy building a farm buggy listed under this thread: viewtopic.php?f=23&t=38835
I need to replace the push rod tubes and could not find any of the spring-loaded tubes locally, so I got these:

I need some advice (I am a complete noob on mechanical issues) on how to install them correctly. This is what I intend to do:
1) Remove valve cover;
2) Remove rocker assembly;
3) Remove push rods (and keep them in order as I remove it)
4) Remove the head;
5) remove the old tubes and replace with new tubes (in this regard, with what grease can I seal the new tube seals - standard WB grease? I have also read somewhere that the tubes need to be stretched to 190mm - but as I measure the new tubes the length between the seals as they seat properly is already at 190mm. Is it still necessary to stretch them or is it a stretch until it fits properly situation?)
6) Re-attach the head (What is the tightening order?)
7) Insert the push rods and re-attach the rocker assembly;

Any advice would be appreciated.
Thank you in advance