Adjusting WG K5500 picture to fill screen

rhistr

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Hello! I recently purchased a WG K5500 chassis to replace my aging one. Problem is, I hooked it up and got a picture only in the center of the screen and trying to adjust the V. Size causes the picture to fold over. It doesn't reach the edges of the screen seemingly no matter how much or what I adjust. I haven't tried the horizontal width coil yet, assuming that will only help with the horizontal width. Here's some pictures of the problem and the chassis. I'm new to this sort of thing--I generally can label the parts, remove and hook up a chassis, etc. but haven't run into this particular issue where I can't get the picture to reach even the sides of the screen. Any and all help is greatly appreciated!

PICTURE of the vertical distortion when V. Size is increased
IMG_0390.jpg

PICTURE of V. Size lowered until the vertical distortion went away
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PICTURES of the chassis
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image0 (3).jpeg
 
are you sure that's a K5500 and not a K4900 on a 25" tube? cause the width is extremely narrow too. it doesn't look like a K5500
 
are you sure that's a K5500 and not a K4900 on a 25" tube? cause the width is extremely narrow too. it doesn't look like a K5500
That was my fear :/ I can't find much good documentation on the two, but the more I research, the more I'm growing certain it is. My older K5500 has a small pcb board screwed on the left-hand side, like this, and it's what worked with the 25" in the past:

93e22317ccc0a308bd73cf2c2c838629.jpg

...but then I find people trying to sell that exact board untested as a 25" K4900 on ebay and I get confused haha. Either way, I'll contact the seller and go from there. Thank you for your input!
 
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