Sealine 300H / 50H gear swap

[Decker]

I have several Sealine 300H reels.  This is a really good size for East Coast deep bottom fishing for black sea bass, cod, haddock, pollock, ling, maybe even blueline tilefish. It could probably do well with smaller tuna too.  Here is a link to the Sealine reel specs:  https://alantani.com/index.php?action=dlattach;attach=12635;image and the 330H schematic: https://www.mikesreelrepair.com/content/schematics/Daiwa_SL300H2C_300HW.pdf

As you can see the 300H has a 3.7 gear ratio and can hold a quarter mile of heavy braid to get deep. Now, wouldn't it be better for deep fishing if the gear ratio were a little faster, say 4.2:1?  The Sealine 50H has the 4.2:1 ratio, and its main and pinion gears can be put into the 300H.  I've heard from deep-droppers that that is close to the ideal ratio for that type of fishing,  a little bit fast but plenty strong for hauling up big fish and three pound sinkers.

A few years ago I was lucky to find a 50H gear set on ebay (believe it was JD Treasures).  In the pic, you can see the existing 300H gears above and the new 50H gears below.  The 300 drag stack had the original three black fiber washers and one red under-gear washer. The new gears take the same drags.  I'll find carbontex replacements to make the swap.

Going to take my time with this, and post as I make progress...         

[Decker]

Decided to break the budget and ordered an Ultimate Upgrades kit.  Ha -- you didn't know there was a drag kit for the Sealine 50H gear...  Well, my research on this site suggests that Bryan's Penn 114 kit can be made to fit it with minor modification to the main gear (deepen the slots for the eared washers).  There is some risk, but gonna roll the dice... Now thinking I might buy the Cortez sleeve too 

[JasonGotaProblem]

I believe, though I'm often mistaken, that the 50 gears are the same as the 47H gears. I didn't think it looked like the same size as a 114 drag, but I'm wrong a lot. When I did a drag upgrade for a buddy I ended up grinding out the "ridge" around the bottom of the cavity. Its depth was sized for the cardboard drag disk's height and would limit how much you could crank down the drag, and also force you to use a really thick bottom washer. ...so far so good.

Edit: you said 114 not 114H. That sounds more reasonable.

[Decker]

I believe, though I'm often mistaken, that the 50 gears are the same as the 47H gears. I didn't think it looked like the same size as a 114 drag, but I'm wrong a lot. When I did a drag upgrade for a buddy I ended up grinding out the "ridge" around the bottom of the cavity. Its depth was sized for the cardboard drag disk's height and would limit how much you could crank down the drag, and also force you to use a really thick bottom washer. ...so far so good.

Edit: you said 114 not 114H. That sounds more reasonable.

Yes, 114, not 114H.  Thanks, that bottom ridge might be a problem, but there are multiple ways to resolve it.  We'll see...  Although inexperienced in this stuff, I'm encouraged by what I've read on the site.

[Decker]

I don't know if others use this trick to scour the site for timeless tidbits of knowledge, but this is what I do (click and see how to use Google to find obscure technical details on alantani.com): https://www.google.com/search?q=site%3Aalantani.com+50H+114+855+drag