Roll-N-Lock 16-22 Nissan Titan XD CC (w/o Titan Box or OE Tracks 78.7in) M-Series XT Retractable Cvr

This 124M-XT is my second purchase of a Roll-n-Lock retractable cover. My first was a 2017 Chevy Colorado 261M-XT with a much stronger and more reliable retractable mechanism than the current 124M-XT. Are there simple instructions available for me to tighten the spring and improve the retractability.

I installed the cover and it works as far as the retracting and closing of the cover, I definitely love this more than the roll up cover I had on my last truck. It also clicks and stops in place so you can have it partially open/closed, that's an awesome feature. However there are spots where water enters into truck bed at the corners. Where the drum is, I attached a picture that shows the gap, I think this can be corrected if they cut the weather stripping in correct place instead of overlapping each other. At the rear of the bed there is a gap between the cover and the rails that lets water in. However I have a bed floor mat so most of the water travels down and underneath the mat so it's not a huge big deal but enough for me to not store tools in the truck bed, to keep from rusting. If they made it to where there was like a wedge seal on the rails then I think this cover would be perfect. I attached a picture of it as well, where the gap is. I also think the gap may close up if you mount the rails about 1/8” or 1/4” shorter than what the directions say, I have not tried this yet, I may try it at an 1/8” shorter to allow for expansion/contraction of the materials but still be smooth for opening and closing the cover. Or I may try to find a rubber seal in shape of wedge and see if that works. Whichever I do I will try to post a follow up afterwards. Overall I really do like the cover and would buy it again if these issues were corrected. Lastly, the installation instructions could use some work to make it easier to understand.