X4 Springs

Hi Thunderers.

I’d like to upgrade the spring strength in my X4 and was wondering if anybody around here knew a decent source.

I know X4Labs has/had them on the website, but the last time I ordered something from them I didn’t get any merchandise or follow up communication. Kind think they might be out of business…

I’m fairly sure I could learn how to measure springs and scour the interweb for something that meets the need, but thought I’d ask here first in case someone already knows the answer.

Thanks guys