How to change the Scale of an Object

Hey, im trying to add a new feature to a mod of mine, it basically allow the user to make the "object" bigger or smaller on his screen, i will add an scrolling bar to modify this value but first i need to make it work, this is my code:

package com.henixmc.www.coders.infinity.mods.clockmod;

import java.awt.Color;
import java.text.SimpleDateFormat;

import org.lwjgl.opengl.GL11;

import com.henixmc.www.coders.infinity.mods.keystrokes.KeystrokesMod;

import cpw.mods.fml.common.eventhandler.SubscribeEvent;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.Gui;
import net.minecraftforge.client.event.RenderGameOverlayEvent;

public class CLOCKRenderer
{
    private final Minecraft mc;
    int index = 0;
    long x = 0L;

    public static Color rainbowEffect(float f, float fade)
    {
        int speed = 10000 / KeystrokesMod.chromaspeed;
        int color = Color.HSBtoRGB((float)(System.currentTimeMillis() % speed) / speed, 0.7F, 0.8F);
        Color c = new Color((int)color);
        return new Color(c.getRed() / 255.0F * fade, c.getGreen() / 255.0F * fade, c.getBlue() / 255.0F * fade, c.getAlpha() / 255.0F);
    }

    public CLOCKRenderer()
    {
        this.mc = Minecraft.getMinecraft();
    }

    @SubscribeEvent
    public void onRenderGameOverlay(RenderGameOverlayEvent event)
    {
        if ((event.type != RenderGameOverlayEvent.ElementType.EXPERIENCE) || (event.isCancelable())) {
            return;
        }
        if ((!KeystrokesMod.enabledClock)) {
            return;
        }
        if ((this.mc.gameSettings.showDebugInfo)) {
            return;
        }
        int clockcolor = Integer.MAX_VALUE;
        if (KeystrokesMod.ColorsClock == 0) {
            clockcolor = 2130706432;
        } else if (KeystrokesMod.ColorsClock == 1) {
            clockcolor = 2130706602;
        } else if (KeystrokesMod.ColorsClock == 2) {
            clockcolor = 2130749952;
        } else if (KeystrokesMod.ColorsClock == 3) {
            clockcolor = 2130750122;
        } else if (KeystrokesMod.ColorsClock == 4) {
            clockcolor = 2141847552;
        } else if (KeystrokesMod.ColorsClock == 5) {
            clockcolor = 2141847722;
        } else if (KeystrokesMod.ColorsClock == 6) {
            clockcolor = 2147461632;
        } else if (KeystrokesMod.ColorsClock == 7) {
            clockcolor = 2141891242;
        } else if (KeystrokesMod.ColorsClock == {
            clockcolor = 2136298837;
        } else if (KeystrokesMod.ColorsClock == 9) {
            clockcolor = 2136299007;
        } else if (KeystrokesMod.ColorsClock == 10) {
            clockcolor = 2136342357;
        } else if (KeystrokesMod.ColorsClock == 11) {
            clockcolor = 2136342527;
        } else if (KeystrokesMod.ColorsClock == 12) {
            clockcolor = 2147439957;
        } else if (KeystrokesMod.ColorsClock == 13) {
            clockcolor = 2147440127;
        } else if (KeystrokesMod.ColorsClock == 14) {
            clockcolor = 2147483477;
        } else if (KeystrokesMod.ColorsClock == 15) {
            clockcolor = Integer.MAX_VALUE;
        } else if (KeystrokesMod.ColorsClock == 16) {
            clockcolor = rainbowEffect(this.index + (float)this.x * 4000.0F, 1.0F).getRGB();
        }
        else if (KeystrokesMod.ColorsClock == 17) {
            Color textdemocolor = new Color(KeystrokesMod.r2, KeystrokesMod.g2, KeystrokesMod.b2, KeystrokesMod.alpha2);
            clockcolor = textdemocolor.getRGB();
        }

        String timeStamp1 = new SimpleDateFormat("hh:mm:ss").format(new java.util.Date());
        String timeStamp = timeStamp1;
        if(KeystrokesMod.BackgroundBox) {

            Color mycolour = new Color(KeystrokesMod.r, KeystrokesMod.g, KeystrokesMod.b, KeystrokesMod.alpha);

            Gui.drawRect(KeystrokesMod.coordsClockX, KeystrokesMod.coordsClockY, KeystrokesMod.coordsClockX + 58, KeystrokesMod.coordsClockY + 13, mycolour.getRGB());

            this.mc.fontRenderer.drawString(timeStamp, KeystrokesMod.coordsClockX + 9, KeystrokesMod.coordsClockY + 3, clockcolor);
        }

        if(!KeystrokesMod.BackgroundBox) {
            this.mc.fontRenderer.drawStringWithShadow(timeStamp, KeystrokesMod.coordsClockX + 9, KeystrokesMod.coordsClockY + 3, clockcolor);

        }

    }
}
 

[/CODE]

I was thinking about using this for the scale but it gets kinda buggy and change the scale of everything in the screen if i use it, so, how should i properly use this? or, is there another method?

[CODE]

            GL11.glScalef(1.1F, 1.1F, 0.0F);

[/CODE]

Screenshot with and without the buggy thing bellow: