What plane? What scale?
I would think you could simply lathe it from a rubber stopper (or hard foam rubber). Just run a shaft through the piece to be lathed and chuck it in your drill, then use a Dremel to cut the profile while the piece is spinning on the drill. It might require and extra pair of hands or a vise to hold your drill steady, but it's a quick way to make your parts without the time and expense of making molds.
Just looking through your blog
, another thing you could do... and it's REALLY simple...you could just get the correct size spring and shrink-tube over it. Some shrink-tubing is hard when shrunk, and there are other types that remain flexible
From what I can tell in the original drawing
, those shocks have an external spring with a dust-boot over them. The boot appears to have a helical shape rather than an accordion "dust gator" like some motorcycles--which have the springs on the inside. Or am I reading that wrong? Maybe the shadows and the image being at an angle are throwing me off?
Nevermind. Looking at this photo, I can see that there is no spring... it's just a typical accordion boot. And in other photos, I notice than most of the He-111's were missing the boot... they probably dry-rotted off and never got replaced.