If you used a thin enough screw you could probably use a cut down pen spring, although a stiffer spring is recommended.ģ) Washers- This is also optional. I would have used a hex head screw but the only screws I had on hand of this size has the thumb grips.Ģ) Spring that fits over screw threads- This is optional, but is recommended if you want to keep the screw from turning from vibrations during a game. I used a 10-32 size screw, as was suggested to me when I first learned of this mod, but you can use whatever size you like as long as the diameter is less than the width of the hopup arm. If you have ever tried building something without a parts list, let me tell you, it's much more time consuming than it has to be.ġ) Screw- This is the only mandatory part really. Thank's MiloXC3 for making this great video:įirst thing's first you need to get everything in order. The process is slightly different from mine, in that you don't tap the barrel to make the threads, instead gluing a nut over the hole to provide threads, but it gets the same result. MiloXC3 made this video tutorial on how to do the TDC mod. I still recommend you shim your hopup arm, although this is only for greater consistency and to make sure it is all kept rigid. This will keep the hopup arm straight and keep the bb going dead straight, that is unless you either have the nub uneven or the bucking mound is uneven. Some people also have a curving issue, most common on VSR rifles though not always, that you just can't seem to fix with shims.
This will give you the consistency of a fixed hop, while being able to adjust it. So why should you do this mod? I'm sure you know that a fixed hop is more consistent than an adjustable hop, because the adjustable hop can move a bit when you fire it. This is just my method, as I am sure there are quite a few methods, however similar, of achieving the same result. This particular gun doesn't take any line of upgrades, as it is not a clone of anything, but I was still able to fit my nineball bucking in there. I happen to have an old Well MB-10 that I haven't done this mod to yet, so I will show you how using this rifle.
For a long time now there has been no guide, tutorial, or any other instructions on how to do this other than people posting questions on how to do it over and over again. It was originally one of Newbie's kits but because it is so easy to do, it has transformed into a cheaper in price D.I.Y. So we have all heard of the Top Dead Center mod, or TDC mod.
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