Can u tell me how to load the staples into my arrow t25 staple gun not used it for a long time

Morning Vivian,

Have a look at this link to Arrow's website. It may be that they don't fit as I can't cross reference them?
http://www.arrowfastener.com/ccrz__Products?categoryId=a1a40000000C7FhAAK&isCSRFlow=true&portalUser=&store=arrowfastener

were you reloading the staple gun, now you want to put the spring load back in it to lock it to use it? slide it in, and push downward to lock it in.

Far as I know (and I own one) there is no height adjustment. It's preset to avoid damaging the cable.

There is a clip at the lower rear of the stapler--lift this clip upwards which releases the staple tension device which is the clip, a rod, a long spring, and a 'U' shaped clip on the far end. Pull this device all the way out, insert one length of staples into the slot that is revealed, then reinsert the tension device until the small clip re-locks at the rear of the stapler frame. One staple ejects per squeeze of the firing lever--hold the nose of the stapler firmly to the material to allow penetration of the staple. Hope this helps!

Sounds like the slide and the spring and the snapin end are missing. Your local hardware store may have one or can order one for you. Take the tool with you so they can tell whats missing.

pull all staples out and take a screw driver and hammer drive the plunger back down into stapler till the hung staple is released

I think you just answered your own question. I have had one single staple stuck at the "output" where the staple shoot out and it drove me insane for a few until I slowed my roll, took a deep breath and said, I have got to be smarter than a piece of metal here, and took a calm slow looksy. Sure enough, it was one loan staple causing a backup of the rest. I have also had issues with overloading staples which eventually makes the spring pushup rod become less forceful as it pushes the staples up for firing. Not an issue until you get towards the last dozen staples or so, which can also lead to the last staple not quite getting that millimeter push ahead, to shoot out correctly. These staple guns are like babies. Have to treat them nice and pamper them and heaven forbid you ever drop that stapler cause if dropped more than likely it will never quite be the same again. Telecom Tech 16 years.

at the back end of the handle, there is a retainer spring loaded clip. Push it in, then push it downward toward the base of the stapler, the clip should then release the spring, pull the rod with the spring completely out, slide a row of staple in where the rod came out, ONLY ONE ROW, then insert the rod with the spring back in and push it firmly in, and lift it upward to engage the lock. and fire away... Hope this gets your working

Take out the screw/nut combo @ the end of the gun where you load the staples. The whole rail that holds the staples will then come out and you can then get the little devils of the nested, jammed, rousted up staples out by sliding them out with a screwdriver. Don't jam the screwdriver into your fingers/hand when doing it.

Typical staple sizes are 1/4?, 5/16?, 3/8?, 1/2?, 9/16?, and 17/32? (6.4, 7.9, 9.5, 12.7, 14.3, 13.5 millimeters).