Shock absorver for Open truggy

I made this for the open rc truggy
https://www.thingiverse.com/thing:42198
I used some springs that are 50mm long and 10mm of diameter.
I use it to test it while I'm finishing it, most problably I will change it to some ones made of metal in a near future.
The piston part needs some suppor on the part with the small hole, is better to print it horizontal for more strengt.
The other part can be printed vertically and does not need support, but maybe you will need to use an 8mm drill bit for